Cavalier King Charles Spaniel
Encyclopedia
The Cavalier King Charles Spaniel is a small breed
Dog breed
Dog breeds are groups of closely related and visibly similar domestic dogs, which are all of the subspecies Canis lupus familiaris, having characteristic traits that are selected and maintained by humans, bred from a known foundation stock....

 of Spaniel
Spaniel
A spaniel is a type of gun dog. It is assumed spaniels originated from Spain as the word spaniel may be derived from Hispania or possibly from the French phrase "Chiens de l’Espagnol" . Spaniels were especially bred to flush game out of dense brush. By the late 17th century spaniels had become...

-type
Dog type
Dog types are broad categories of dogs based on function, with dogs identified primarily by specific function or style of work rather than by lineage or appearance....

 dog
Dog
The domestic dog is a domesticated form of the gray wolf, a member of the Canidae family of the order Carnivora. The term is used for both feral and pet varieties. The dog may have been the first animal to be domesticated, and has been the most widely kept working, hunting, and companion animal in...

, and is classed as a toy dog
Toy dog
Toy dog traditionally refers to a very small dog or a grouping of small and very small breeds of dog. A toy dog may be of any of various dog types. Types of dogs referred to as toy dogs may include Spaniels, Pinschers and Terriers that have been bred down in size. Not all toy dogs are lapdogs,...

 by most kennel club
Kennel club
A kennel club is an organization for canine affairs that concerns itself with the breeding, showing and promotion of more than one breed of dog...

s. It is one of the most popular breeds in the United Kingdom. Since 2000, it has been growing in popularity in the United States. It is a smaller breed of spaniel, and Cavalier adults are often the same size as adolescent dogs of other spaniel breeds. It has a silky coat and commonly an undocked tail. The breed standard recognizes four colours (Blenheim, Tricolour [black/white/tan], Black and Tan, and Ruby). The breed is generally friendly, affectionate and good with both children and other animals.

The King Charles changed drastically in the late 17th century, when it was interbred with flat-nosed breeds. Until the 1920s, the Cavalier shared the same history as the smaller King Charles Spaniel
King Charles Spaniel
The King Charles Spaniel is a small dog breed of the spaniel type. In 1903, the Kennel Club combined four separate toy spaniel breeds under this single title...

. Breeders attempted to recreate what they considered to be the original configuration of the breed, a dog resembling Charles II
Charles II of England
Charles II was monarch of the three kingdoms of England, Scotland, and Ireland.Charles II's father, King Charles I, was executed at Whitehall on 30 January 1649, at the climax of the English Civil War...

's King Charles Spaniel of the Restoration
English Restoration
The Restoration of the English monarchy began in 1660 when the English, Scottish and Irish monarchies were all restored under Charles II after the Interregnum that followed the Wars of the Three Kingdoms...

.

Various health issues affect this particular breed, most notably mitral valve disease, which leads to heart failure. This will appear in most Cavaliers at some point in their lives and is the most common cause of death. The breed may also suffer from Syringomyelia
Syringomyelia
Syringomyelia is a generic term referring to a disorder in which a cyst or cavity forms within the spinal cord. This cyst, called a syrinx, can expand and elongate over time, destroying the spinal cord. The damage may result in pain, paralysis, weakness, and stiffness in the back, shoulders, and...

, in which cavities are formed in the spinal cord, possibly associated with malformation of the skull
Skull
The skull is a bony structure in the head of many animals that supports the structures of the face and forms a cavity for the brain.The skull is composed of two parts: the cranium and the mandible. A skull without a mandible is only a cranium. Animals that have skulls are called craniates...

 that reduces the space available for the brain
Brain
The brain is the center of the nervous system in all vertebrate and most invertebrate animals—only a few primitive invertebrates such as sponges, jellyfish, sea squirts and starfishes do not have one. It is located in the head, usually close to primary sensory apparatus such as vision, hearing,...

. Cavaliers are also affected by ear problems, a common health problem among spaniel
Spaniel
A spaniel is a type of gun dog. It is assumed spaniels originated from Spain as the word spaniel may be derived from Hispania or possibly from the French phrase "Chiens de l’Espagnol" . Spaniels were especially bred to flush game out of dense brush. By the late 17th century spaniels had become...

s of various types, and they can suffer from such other general maladies as hip dysplasia, which are common across many types of dog breeds.

History

During the 16th century, a small type of spaniel was popular among the nobility in England
England
England is a country that is part of the United Kingdom. It shares land borders with Scotland to the north and Wales to the west; the Irish Sea is to the north west, the Celtic Sea to the south west, with the North Sea to the east and the English Channel to the south separating it from continental...

. The people of the time believed that these dogs could keep fleas away, and some even believed that they could prevent forms of stomach illnesses. These dogs were sometimes called the "Spaniel Gentle" or "Comforter", as ladies taking a carriage ride would take a spaniel on their laps to keep them warm during the winter. Charles I
Charles I of England
Charles I was King of England, King of Scotland, and King of Ireland from 27 March 1625 until his execution in 1649. Charles engaged in a struggle for power with the Parliament of England, attempting to obtain royal revenue whilst Parliament sought to curb his Royal prerogative which Charles...

 kept a spaniel named Rogue while residing at Carisbrooke Castle
Carisbrooke Castle
Carisbrooke Castle is a historic motte-and-bailey castle located in the village of Carisbrooke, near Newport, Isle of Wight, England. Charles I was imprisoned at the castle in the months prior to his trial.-Early history:...

; however, it is with Charles II
Charles II of England
Charles II was monarch of the three kingdoms of England, Scotland, and Ireland.Charles II's father, King Charles I, was executed at Whitehall on 30 January 1649, at the climax of the English Civil War...

 that this breed is closely associated and it was said of him that "His Majesty was seldom seen without his little dogs". There is a myth that he even issued an edict that no spaniels of this type could be denied entry to any public place.

During the reign of King William III
William III of England
William III & II was a sovereign Prince of Orange of the House of Orange-Nassau by birth. From 1672 he governed as Stadtholder William III of Orange over Holland, Zeeland, Utrecht, Guelders, and Overijssel of the Dutch Republic. From 1689 he reigned as William III over England and Ireland...

 and Queen Mary II, the long nosed style of spaniel went out of fashion. The Pug
Pug
The pug is a "toy" breed of dog with a wrinkly, short-muzzled face, and curled tail. The breed has a fine, glossy coat that comes in a variety of colors, and a compact square body with well-developed muscle. They have been described as multum in parvo , referring to the pug's personality and...

 was the favoured dog at the time in the Netherlands
Netherlands
The Netherlands is a constituent country of the Kingdom of the Netherlands, located mainly in North-West Europe and with several islands in the Caribbean. Mainland Netherlands borders the North Sea to the north and west, Belgium to the south, and Germany to the east, and shares maritime borders...

, and with William's Dutch
Dutch people
The Dutch people are an ethnic group native to the Netherlands. They share a common culture and speak the Dutch language. Dutch people and their descendants are found in migrant communities worldwide, notably in Suriname, Chile, Brazil, Canada, Australia, South Africa, New Zealand, and the United...

 origin, they became popular in England too. At this time interbreeding may have occurred with the Pug, or other flat nosed breeds, as the King Charles took on some Pug-like characteristics, but in any event the modern King Charles Spaniel
King Charles Spaniel
The King Charles Spaniel is a small dog breed of the spaniel type. In 1903, the Kennel Club combined four separate toy spaniel breeds under this single title...

 emerged. In The Dog in 1852, William Youatt
William Youatt
William Youatt , was an English veterinary surgeon.Youatt was the son of a surgeon residing at Exeter. He was educated for the nonconformist ministry. In 1810 he left Devonshire, and undertook ministerial and scholastic duties in London...

 was critical of the change in the breed:
During the early part of the 18th century, John Churchill, 1st Duke of Marlborough
John Churchill, 1st Duke of Marlborough
John Churchill, 1st Duke of Marlborough, Prince of Mindelheim, KG, PC , was an English soldier and statesman whose career spanned the reigns of five monarchs through the late 17th and early 18th centuries...

, kept red and white King Charles type spaniels for hunting. The duke recorded that they were able to keep up with a trotting horse. His estate was named Blenheim
Blenheim Palace
Blenheim Palace  is a monumental country house situated in Woodstock, Oxfordshire, England, residence of the dukes of Marlborough. It is the only non-royal non-episcopal country house in England to hold the title of palace. The palace, one of England's largest houses, was built between...

 in honour of his victory at the Battle of Blenheim
Battle of Blenheim
The Battle of Blenheim , fought on 13 August 1704, was a major battle of the War of the Spanish Succession. Louis XIV of France sought to knock Emperor Leopold out of the war by seizing Vienna, the Habsburg capital, and gain a favourable peace settlement...

. Because of this influence, the red and white variety of the King Charles Spaniel and thus the Cavalier King Charles Spaniel became known as the Blenheim.

Attempts were made to recreate the original King Charles Spaniel as early as the turn of the 20th century, using the now extinct Toy Trawler Spaniel
Toy Trawler Spaniel
The Toy Trawler Spaniel is an extinct breed of Spaniel which physically was similar to the King Charles Spaniel of the 16th century. It is considered to have descended from the original King Charles Spaniel, and the older variety of Sussex Spaniel. It was originally used as a sporting dog, but...

s. These attempts were documented by Judith Blunt-Lytton, 16th Baroness Wentworth
Judith Blunt-Lytton, 16th Baroness Wentworth
Judith Anne Dorothea Blunt-Lytton, 16th Baroness Wentworth also known as Lady Wentworth was a British peeress, Arabian horse breeder and tennis player...

, in the book "Toy Dogs and Their Ancestors Including the History And Management of Toy Spaniels, Pekingese, Japanese and Pomeranians" published under the name of the "Hon. Mrs Neville Lytton" in 1911.

Divergence from King Charles Spaniel

In 1926, American Roswell Eldridge offered a dog show class prize of twenty-five pounds each as a prize for the best male and females of "Blenheim Spaniels of the old type, as shown in pictures of Charles II of England
Charles II of England
Charles II was monarch of the three kingdoms of England, Scotland, and Ireland.Charles II's father, King Charles I, was executed at Whitehall on 30 January 1649, at the climax of the English Civil War...

's time, long face, no stop, flat skull, not inclined to be domed, with spot in centre of skull." The breeders of the era were appalled, although several entered what they considered to be sub-par King Charles Spaniels in the competition. Eldridge died before seeing his plan come to fruition, but several breeders believed in what he said and in 1928 the first Cavalier club was formed. The first standard was created, based on a dog named "Ann's Son" owned by Mostyn Walker, and the The Kennel Club
The Kennel Club
The Kennel Club is a kennel club based in London and Aylesbury, United Kingdom.The Kennel Club registration system divides dogs into seven breed groups. The Kennel Club Groups are: Hound, Working, Terrier, Gundog, Pastoral, Utility and Toy...

 recognised the breed as "King Charles Spaniels, Cavalier type".

World War II
World War II
World War II, or the Second World War , was a global conflict lasting from 1939 to 1945, involving most of the world's nations—including all of the great powers—eventually forming two opposing military alliances: the Allies and the Axis...

 caused a drastic setback to the breed, with the vast majority of breeding stock destroyed because of the hardship. For instance, in the Ttiweh Cavalier Kennel, the population of sixty dropped to three during the 1940s. Following the war, just six dogs would be the starting block from which all Cavaliers descend. These dogs were Ann's Son, his litter brother Wizbang Timothy, Carlo of Ttiweh, Duce of Braemore, Kobba of Kuranda and Aristide of Ttiweh. The numbers increased gradually, and in 1945 The Kennel Club first recognised the breed in its own right as the Cavalier King Charles Spaniel.

The history of the breed in America is relatively recent. The first recorded Cavalier living in the United States was brought from the United Kingdom in 1956 by W. Lyon Brown, together with Elizabeth Spalding and other enthusiasts, she founded the Cavalier King Charles Club USA which continues to the present day. In 1994, the American Cavalier King Charles Spaniel Club was created by a group of breeders to apply for recognition by the American Kennel Club
American Kennel Club
The American Kennel Club is a registry of purebred dog pedigrees in the United States. Beyond maintaining its pedigree registry, this kennel club also promotes and sanctions events for purebred dogs, including the Westminster Kennel Club Dog Show, an annual event which predates the official...

. The Cavalier would go on to be recognised in 1997, and the ACKCSC became the parent club for Cavaliers.

Description

The Cavalier King Charles Spaniel is one of the largest toy breeds. Historically it was a lap dog
Lap dog
A lapdog or lap dog is a dog that is small enough to be held in the arms or lie comfortably on a person's lap. Lapdogs are not a specific breed, but is a generic term for a type of dog of small size and friendly disposition....

, and modern day adults can fill a lap easily. Nonetheless, it is small for a spaniel
Spaniel
A spaniel is a type of gun dog. It is assumed spaniels originated from Spain as the word spaniel may be derived from Hispania or possibly from the French phrase "Chiens de l’Espagnol" . Spaniels were especially bred to flush game out of dense brush. By the late 17th century spaniels had become...

, with fully grown adults comparable in size to adolescents of other larger spaniel breeds. Breed standards state that height of a Cavalier should be between 12 to 13 in (30.5 to 33 cm) with a proportionate weight between 10 to 18 lb (4.5 to 8.2 kg). The tail is usually not docked, and the Cavalier should have a silky coat of moderate length. Standards state that it should be free from curl, although a slight wave is allowed. Feathering can grow on their ears, feet, legs and tail in adulthood. Standards require this be kept long, with the feathering on the feet a particularly important aspect of the breed's features.

The Cavalier King Charles Spaniel and the English Toy Spaniel can be often confused with each other. In the United Kingdom, the English Toy Spaniel is called the King Charles Spaniel
King Charles Spaniel
The King Charles Spaniel is a small dog breed of the spaniel type. In 1903, the Kennel Club combined four separate toy spaniel breeds under this single title...

 while in the United States, one of the colours of the Toy Spaniel is known as King Charles. The two breeds share similar history and only diverged from each other about 100 years ago. There are several major differences between the two breeds, with the primary difference being the size. While the Cavalier weighs on average between 10 to 18 lb (4.5 to 8.2 kg), the King Charles is smaller at 9 to 12 lb (4.1 to 5.4 kg). In addition their facial features while similar, are different; the Cavalier's ears are set higher and its skull is flat while the King Charles's is domed. Finally the muzzle length of the Cavalier tends to be longer than that of its King Charles cousin.

Colour

The breed has four recognized colours. Cavaliers which have rich chestnut markings on a pearly white background are known as Blenheim in honour of Blenheim Palace
Blenheim Palace
Blenheim Palace  is a monumental country house situated in Woodstock, Oxfordshire, England, residence of the dukes of Marlborough. It is the only non-royal non-episcopal country house in England to hold the title of palace. The palace, one of England's largest houses, was built between...

, where John Churchill, 1st Duke of Marlborough
John Churchill, 1st Duke of Marlborough
John Churchill, 1st Duke of Marlborough, Prince of Mindelheim, KG, PC , was an English soldier and statesman whose career spanned the reigns of five monarchs through the late 17th and early 18th centuries...

, raised the predecessors to the Cavalier breed in this particular colour. In some dogs there is a chestnut spot in the middle of the forehead: this is called the "blenheim" spot. Black and Tan are dogs with black bodies with tan highlights, particularly eyebrows, cheeks, legs and beneath the tail. Black and Tan is referred to as "King Charles" in the King Charles Spaniel. Ruby Cavaliers should be entirely chestnut all over, although some can have some white in their coats which is considered a fault under American Kennel Club
American Kennel Club
The American Kennel Club is a registry of purebred dog pedigrees in the United States. Beyond maintaining its pedigree registry, this kennel club also promotes and sanctions events for purebred dogs, including the Westminster Kennel Club Dog Show, an annual event which predates the official...

 conformation show
Conformation show
Conformation shows, also referred to as breed shows, are a kind of dog show in which a judge familiar with a specific dog breed evaluates individual purebred dogs for how well the dogs conform to the established breed type for their breed, as described in a breed's individual breed standard.A...

 rules. The fourth colour is known as Tricolour, which is black and white with tan markings on cheeks, inside ears, on eyebrows, inside legs, and on underside of tail. This colour is referred to as "Prince Charles" in the King Charles Spaniel
King Charles Spaniel
The King Charles Spaniel is a small dog breed of the spaniel type. In 1903, the Kennel Club combined four separate toy spaniel breeds under this single title...

.

Popularity

According to statistics released by The Kennel Club
The Kennel Club
The Kennel Club is a kennel club based in London and Aylesbury, United Kingdom.The Kennel Club registration system divides dogs into seven breed groups. The Kennel Club Groups are: Hound, Working, Terrier, Gundog, Pastoral, Utility and Toy...

, Cavaliers were the sixth most popular dog in the United Kingdom in 2007 with 11,422 registrations in a single year. Labrador Retrievers were the most popular with 45,079 registrations in that year. Their popularity is on the rise in America; in 1998 they were the 56th most popular breed but in both 2007 and 2008 they were the 25th most popular. They ranked higher in some individual US cities in the 2008 statistics, being eighth in both Nashville and Minneapolis-St.Paul, seventh in Boston
Boston
Boston is the capital of and largest city in Massachusetts, and is one of the oldest cities in the United States. The largest city in New England, Boston is regarded as the unofficial "Capital of New England" for its economic and cultural impact on the entire New England region. The city proper had...

, Atlanta and Washington D.C., and sixth in both New York City
New York City
New York is the most populous city in the United States and the center of the New York Metropolitan Area, one of the most populous metropolitan areas in the world. New York exerts a significant impact upon global commerce, finance, media, art, fashion, research, technology, education, and...

 and San Francisco. In 2009, the Cavalier was the fourth most popular breed in Australia with 3,196 registrations behind only Labrador Retriever
Labrador Retriever
The Labrador Retriever is one of several kinds of retriever, a type of gun dog. A breed characteristic is webbed paws for swimming, useful for the breed's original purpose of retrieving fishing nets. The Labrador is the most popular breed of dog by registered ownership in Canada, the United...

s, German Shepherd Dog
German Shepherd Dog
The German Shepherd Dog , also known as an Alsatian or just the German Shepherd, is a breed of large-sized dog that originated in Germany. The German Shepherd is a relatively new breed of dog, with its origin dating to 1899. As part of the Herding Group, the German Shepherd is a working dog...

s and Staffordshire Bull Terrier
Staffordshire Bull Terrier
The Staffordshire Bull Terrier is a medium-sized, short-coated, old-time breed of dog. It is an English dog, where it is the 5th most popular breed, and related to the bull terrier...

s. In addition, there are also national breed clubs in Belgium, Canada, Czech Republic, Denmark, Finland, France, Germany, Italy, Netherlands, New Zealand, Norway, South Africa, Spain and Sweden.

Temperament

The breed is highly affectionate, playful, extremely patient and eager to please. As such, dogs of the breed are good with children and other dogs. Cavaliers are not shy about socialising with much larger dogs. They will adapt quickly to almost any environment, family, and location. Their ability to bond with larger and smaller dogs make them ideal in houses with more than one breed of dog as long as the other dog is trained. The breed is great with people of all ages, from children to seniors, making them a very versatile dog. Cavaliers rank 44th in Stanley Coren
Stanley Coren
Stanley Coren is a psychology professor and neuropsychological researcher who has become best known to the general public for a series of books regarding the intelligence, mental abilities and history of dogs...

's The Intelligence of Dogs
The Intelligence of Dogs
The Intelligence of Dogs is a book on dog intelligence by Stanley Coren, a professor of psychology at the University of British Columbia in Vancouver. Published in 1994, the book explains Coren's theories about the differences in intelligence between different breeds of dogs...

, being of average intelligence in working or obedience. Cavaliers are naturally curious and playful, but also enjoy simply cuddling up on a cushion or lap.

Cavaliers are active and sporting. They have an instinct to chase most things that move including while on busy streets, and so most Cavaliers will never become "street-wise". As they tend to regard all strangers as friends, members of the breed will usually never make good guard dogs. Spaniels have a strong hunting
Hunting
Hunting is the practice of pursuing any living thing, usually wildlife, for food, recreation, or trade. In present-day use, the term refers to lawful hunting, as distinguished from poaching, which is the killing, trapping or capture of the hunted species contrary to applicable law...

 instinct and may endanger birds and small animals. However, owners have reported that through training their Cavaliers live happily with a variety of small animals including hamster
Hamster
Hamsters are rodents belonging to the subfamily Cricetinae. The subfamily contains about 25 species, classified in six or seven genera....

s and gerbil
Gerbil
A gerbil is a small mammal of the order Rodentia. Once known simply as "desert rats", the gerbil subfamily includes about 110 species of African, Indian, and Asian rodents, including sand rats and jirds, all of which are adapted to arid habitats...

s.

Health

Cavaliers can often suffer from some serious genetic health problems, including early-onset mitral valve disease (MVD), the potentially severely painful syringomyelia
Syringomyelia
Syringomyelia is a generic term referring to a disorder in which a cyst or cavity forms within the spinal cord. This cyst, called a syrinx, can expand and elongate over time, destroying the spinal cord. The damage may result in pain, paralysis, weakness, and stiffness in the back, shoulders, and...

 (SM), hip dysplasia, luxating patellas, and certain vision and hearing disorders. As today's Cavaliers all descend from only six dogs, any inheritable disease present in at least one of the original founding dogs can be passed on to a significant proportion of future generations. This is known as the founder effect
Founder effect
In population genetics, the founder effect is the loss of genetic variation that occurs when a new population is established by a very small number of individuals from a larger population. It was first fully outlined by Ernst Mayr in 1942, using existing theoretical work by those such as Sewall...

 and is the likely cause of the prevalence of MVD in the breed. The health problems shared with King Charles Spaniels include mitral valve disease, luxating patella
Luxating patella
Luxating patella is a condition in which the patella, or kneecap, dislocates or moves out of its normal location....

, and hereditary eye issues such as cataract
Cataract
A cataract is a clouding that develops in the crystalline lens of the eye or in its envelope, varying in degree from slight to complete opacity and obstructing the passage of light...

s and retinal dysplasia
Retinal dysplasia
Retinal dysplasia is an eye disease affecting the retina of animals and, less commonly, humans. It is usually a nonprogressive disease and can be caused by viral infections, drugs, vitamin A deficiency, or genetic defects...

.

Mitral valve disease

Nearly all Cavaliers eventually suffer from disease of the mitral valve
Mitral valve
The mitral valve is a dual-flap valve in the heart that lies between the left atrium and the left ventricle...

, with heart murmurs which may progressively worsen, leading to heart failure. This condition is polygenic (affected by multiple genes), and therefore all lines of Cavaliers worldwide are susceptible. It is the leading cause of death in the breed. A survey by The Kennel Club
The Kennel Club
The Kennel Club is a kennel club based in London and Aylesbury, United Kingdom.The Kennel Club registration system divides dogs into seven breed groups. The Kennel Club Groups are: Hound, Working, Terrier, Gundog, Pastoral, Utility and Toy...

 of the United Kingdom showed that 42.8% of Cavalier deaths are cardiac related. The next most common causes are cancer (12.3%) and old age (12.2%). The condition can begin to emerge at an early age and statistically may be expected to be present in more than half of all Cavalier King Charles Spaniels by age 5. It is rare for a 10-year-old Cavalier not to have a heart murmur. While heart disease is common in dogs generally – one in 10 of all dogs will eventually have heart problems – mitral valve disease is generally (as in humans) a disease of old age. The "hinge" on the heart's mitral valve loosens and can gradually deteriorate, along with the valve's flaps, causing a heart murmur (as blood seeps through the valve between heartbeats) then congestive heart failure. The Cavalier is particularly susceptible to early-onset heart disease, which may be evident in dogs as young as one or two years of age. Veterinary geneticists and cardiologists have developed breeding guidelines to eliminate early-onset mitral valve disease in the breed, but it is unclear if a statistically significant number of breeders follow these guidelines. The chairperson of the UK CKCS Club has said that "There are many members who are still not prepared to health check their breeding stock, and of those who do, it would appear that many would not hesitate to breed from affected animals." The MVD breeding protocol recommends that parents should be at least 2.5 years old and heart clear, and their parents (i.e., the puppy's grandparents) should be heart clear until age 5.

Syringomyelia

Syringomyelia (SM) is a condition affecting the brain and spine, causing symptoms ranging from mild discomfort to severe pain and partial paralysis. It is caused by a malformation in the lower back of the skull which reduces the space available to the brain, compressing it and often forcing it out (herniating it) through the opening into the spinal cord. This blocks the flow of cerebral spinal fluid (CSF) around the brain and spine and increases the fluid's pressure, creating turbulence which in turn is believed to create fluid pockets, or syrinxes (hence the term syringomyelia), in the spinal cord. Syringomyelia is rare in most breeds but has become widespread in the Cavalier King Charles Spaniel, with international research samples in the past few years consistently showing over 90% of cavaliers have the malformation, and that between 30–70% have syrinxes. However, most dogs with syrinxes are not symptomatic. Although symptoms of syringomyelia can present at any age, they typically appear between six months and four years of age in 85% of symptomatic dogs, according to Clare Rusbridge, a research scientist. Symptoms include sensitivity around the head, neck, or shoulders, often indicated by a dog whimpering or frequently scratching at the area of his neck or shoulder. Scratching is often unilateral – restricted to one side of the body. Scratching motions are frequently performed without actually making physical contact with the body ("air scratching"). The scratching behavior appears involuntary and the dog frequently scratches while walking – without stopping – in a way that is very atypical of normal scratching ("bunny hopping"). Scratching typical of SM is usually worse when the dog is wearing a collar, is being walked on leash, or is excited, and first thing in the morning or at night.
Not all dogs with SM show scratching behavior. Not all dogs who show scratching behavior appear to suffer pain, though several leading researchers, including Dr Clare Rusbridge in the UK and Drs Curtis Dewey and Dominic Marino in the US, believe scratching in SM cavaliers is a sign of pain and discomfort and of existing neurological damage to the dorsal horn region of the spine. If onset is at an early age, a first sign may be scratching and/or rapidly appearing scoliosis
Scoliosis
Scoliosis is a medical condition in which a person's spine is curved from side to side. Although it is a complex three-dimensional deformity, on an X-ray, viewed from the rear, the spine of an individual with scoliosis may look more like an "S" or a "C" than a straight line...

. If the problem is severe, there is likely to be poor proprioception
Proprioception
Proprioception , from Latin proprius, meaning "one's own" and perception, is the sense of the relative position of neighbouring parts of the body and strength of effort being employed in movement...

 (awareness of body position), especially with regard to the forelimbs. Clumsiness and falling results from this problem. Progression is variable though the majority of dogs showing symptoms by age four tend to see progression of the condition.

A veterinarian will rule out basic causes of scratching or discomfort such as ear mite
Ear mite
Ear mites are mites that live in the ears of animals. The most commonly seen species is Otodectes cynotis .-Contagion:...

s, flea
Flea
Flea is the common name for insects of the order Siphonaptera which are wingless insects with mouthparts adapted for piercing skin and sucking blood...

s, and allergies, and then, primary secretory otitis media
Otitis media
Otitis media is inflammation of the middle ear, or a middle ear infection.It occurs in the area between the tympanic membrane and the inner ear, including a duct known as the eustachian tube. It is one of the two categories of ear inflammation that can underlie what is commonly called an earache,...

 (PSOM – glue ear), as well as spinal or limb injuries, before assuming that a Cavalier has SM. PSOM can present similar symptoms but is much easier and cheaper to treat. Episodic Falling Syndrome can also present similar symptoms. An MRI scan is normally done to confirm diagnosis of SM (and also will reveal PSOM). If a veterinarian suspects SM he or she will recommend an MRI scan. Neurologists give scanned dogs a signed certificate noting its grade.

Episodic Falling (EF)

Episodic Falling causes "exercise-induced paroxysmal hypertonicity" meaning that there is increased muscle tone in the dog and the muscles cannot relax. Previously thought to be a muscular disorder it is now known to be neurological; recently it has been discovered to be caused by a single recessive gene mutation and there is hope of a genetic test becoming available. Except for severe cases, episodes will be in response to exercise, excitement or similar exertions. Although EF is often misdiagnosed as epilepsy, which typically results in loss of consciousness, the dog remains conscious throughout the episode. Severity of symptoms can range from mild, occasional falling to freezing to seizure-like episodes lasting hours. Episodes can become more or less severe as the dog gets older and there is no standard pattern to the attacks. The onset of symptoms usually occurs before five months but can appear at any age. It is similar to Scotty Cramp
Scotty Cramp
Scotty Cramp is a disease in Scottish Terriers causing spasms and hyperflexion and hyperextension of the legs. It is caused by a disorder in serotonin metabolism that causes a deficiency of available serotonin. It is inherited as an autosomal recessive trait....

, a genetic disorder in Scottish Terrier
Scottish Terrier
The Scottish Terrier , popularly called the Scottie, is a breed of dog. Initially one of the highland breeds of Terrier that were grouped under the name of Skye Terrier, it is one of five breeds of terrier that originated in Scotland, the other four being the modern Skye, Cairn, Dandie Dinmont, and...

s.

Thrombocytopenia and macrothrombocytopenia

As many as half of all Cavalier King Charles Spaniels may have a congenital blood disorder called idiopathic asymptomatic thrombocytopenia
Thrombocytopenia
Thrombocytopenia is a relative decrease of platelets in blood.A normal human platelet count ranges from 150,000 to 450,000 platelets per microliter of blood. These limits are determined by the 2.5th lower and upper percentile, so values outside this range do not necessarily indicate disease...

, an abnormally low number of platelet
Platelet
Platelets, or thrombocytes , are small,irregularly shaped clear cell fragments , 2–3 µm in diameter, which are derived from fragmentation of precursor megakaryocytes.  The average lifespan of a platelet is normally just 5 to 9 days...

s in the blood, according to recent studies in Denmark and the United States. Platelets, or thrombocytes, are disk-shaped blood elements which aid in blood clotting. Excessively low numbers are the most common cause of bleeding disorders in dogs. The platelets in the blood of many Cavalier King Charles Spaniels are a combination of those of normal size for dogs and others that are abnormally oversized, or macrothrombocytes. Macrothrombocytosis also is a congenital abnormality found in at least a third of CKCSs. These large platelets function normally, and the typical Cavalier does not appear to experience any health problems due to either the size or fewer numbers of its platelets.

Hip and knee disorders

Hip dysplasia (HD) is a common genetic disease that affects Cavalier King Charles Spaniels. It is never present at birth and develops with age. Hip dysplasia is diagnosed by X-rays, but it is not usually evident in X-rays of Cavaliers until they mature. Even in adult spaniels with severe HD, X-rays may not always indicate the disease. In a series of evaluations by the Orthopedic Foundation for Animals
Orthopedic Foundation for Animals
The Orthopedic Foundation for Animals is a not-for-profit organization based in Columbia, Missouri that aims to research and prevent orthopedic and hereditary diseases in companion animals....

, the Cavalier was ranked 78th worst out of 157 breeds. The worst affected breeds were the Bulldog
Bulldog
Bulldog is the name for a breed of dog commonly referred to as the English Bulldog. Other Bulldog breeds include the American Bulldog, Olde English Bulldogge and the French Bulldog. The Bulldog is a muscular heavy dog with a wrinkled face and a distinctive pushed-in nose...

, Pug
Pug
The pug is a "toy" breed of dog with a wrinkly, short-muzzled face, and curled tail. The breed has a fine, glossy coat that comes in a variety of colors, and a compact square body with well-developed muscle. They have been described as multum in parvo , referring to the pug's personality and...

 and Dogue de Bordeaux
Dogue de Bordeaux
The Dogue de Bordeaux, Bordeaux Mastiff or French Mastiff or Bordeauxdog is a breed of dog that is strong, powerful, and imposing. The Dogue de Bordeaux is one of the most ancient French breeds. They are a typical brachycephalic molossoid type. Bordeaux are very powerful dogs, with a very muscular...

.

Cavaliers can be subject to a genetic defect of the femur
Femur
The femur , or thigh bone, is the most proximal bone of the leg in tetrapod vertebrates capable of walking or jumping, such as most land mammals, birds, many reptiles such as lizards, and amphibians such as frogs. In vertebrates with four legs such as dogs and horses, the femur is found only in...

 and knee called luxating patella
Luxating patella
Luxating patella is a condition in which the patella, or kneecap, dislocates or moves out of its normal location....

. This condition is most often observed when a puppy is 4 to 6 months old. In the most serious cases, surgery may be indicated. The grading system for the patella runs from 1 (a tight knee), to 4 (a knee so loose that its cap is easily displaced). If a cavalier has a grade 1–2, physical rehabilitation therapy and exercise may reduce the grading and potentially avoid surgery. The grades 3–4 are most severe where surgery will most likely be needed to correct the problem to avoid the development of arthritis
Arthritis
Arthritis is a form of joint disorder that involves inflammation of one or more joints....

 and lameness in the limb.

Eye problems

A disorder commonly found in Cavaliers is keratoconjunctivitis sicca
Keratoconjunctivitis sicca
Keratoconjunctivitis sicca , also called keratitis sicca, xerophthalmia or dry eye syndrome is an eye disease caused by eye dryness, which, in turn, is caused by either decreased tear production or increased tear film evaporation. It is found in humans and some animals...

, colloquially known as "dry eye". The usual cause of this condition is an autoimmune reaction against the dog's lacrimal gland (tear gland), reducing the production of tears. According to the Canine Inherited Disorders Database, the condition requires continual treatment and if untreated may result in partial or total blindness. This disorder can decrease or heal over time.

A 1999 study of Cavaliers conducted by the Canine Eye Registration Foundation showed that an average of 30% of all Cavalier King Charles Spaniels evaluated had eye problems. They include hereditary cataract
Cataract
A cataract is a clouding that develops in the crystalline lens of the eye or in its envelope, varying in degree from slight to complete opacity and obstructing the passage of light...

s, corneal dystrophy
Corneal dystrophy
Corneal dystrophy is a group of disorders, characterised by a noninflammatory, inherited, bilateral opacity of the transparent front part of the eye called the cornea.The distrophies could be subdivided based on specie affected:...

, distichiasis, entropion
Entropion
Entropion is a medical condition in which the eyelid folds inward. It is very uncomfortable, as the eyelashes constantly rub against the cornea. Entropion is usually caused by genetic factors and may be congenital...

, microphthalmia
Microphthalmia
Microphthalmia also referred to as microphthalmos, nanophthalmia or nanophthalmos, is a developmental disorder of the eye that literally means small eye...

, progressive retinal atrophy
Progressive retinal atrophy
Progressive retinal atrophy is a group of genetic diseases seen in certain breeds of dogs and, more rarely, cats. Similar to retinitis pigmentosa in humans, it is characterized by the bilateral degeneration of the retina, causing progressive vision loss culminating in blindness...

, and retinal dysplasia
Retinal dysplasia
Retinal dysplasia is an eye disease affecting the retina of animals and, less commonly, humans. It is usually a nonprogressive disease and can be caused by viral infections, drugs, vitamin A deficiency, or genetic defects...

.

Ear disorders

Primary Secretory Otitis Media (PSOM), also known as glue ear, consists of a highly viscous mucus plug which fills the dog's middle ear and may cause the tympanic membrane to bulge. PSOM has been reported almost exclusively in Cavaliers, and it may affect over half of them. Because the pain and other sensations in the head and neck areas, resulting from PSOM, are similar to some symptoms caused by syringomyelia (SM), some examining veterinarians have mis-diagnosed SM in Cavaliers which actually have PSOM and not SM.

Cavalier King Charles Spaniels may be predisposed to a form of congenital deafness, which is present at birth, due to a lack of formation or early degeneration of receptors in the inner ear, although this is relatively rare. In addition, more recent studies have found Cavaliers that develop a progressive hearing loss, which usually begins during puppyhood and progresses until the dog is completely deaf, usually between the ages of three and five years. The progressive nature of this form of deafness in Cavaliers is believed to be caused by degeneration of the hearing nerve rather than the lack of formation or early degeneration of the inner ear receptors.
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