Yes there is. I have a 1959 pamphlet "Flying Saucers Are!" by Bob Young of Waterloo, IA, that includes an article about Buck Nelson, including a photograph of Big Bo "from the planet Venus--weight 385 lbs."

Dear dwb71,

I have been working on a historical collection of alleged photographs for years now (with several unfortunate interruption). The old and more obscure ones, like Buck Nelson's dog Big Bo, from "Venus" are not easy to come by. I would love to have this photo, of course. Do you have any idea where I might purchase a copy of this pamphlet? Would you be willing to sell me yours or provide a good photocopy of Buck and the dog? I would pay you for the expense.

Thank you,
Joanne Bruno
Washington, Pennsylvania
brunojoanne64@yahoo.com