This question just seems to bring up more questions for me. I went to look up a book that I have had for years that has contracts in it for photographers. Unfortunately I could not put my hands on it but the majority of the contracts were written for mostly fashion models and wedding photographers. I have used them for people but not for animals. I understood you did not have to have releases for animals.
More questions- Why do AP photographers shoot people and not get releases for them - or do they get everyones name in a crowd?
Newspapers photographers, artists and others who create something using animals, people and things - where is the line as to what you need to get a release?
I have always given the person who owns the animals either images or a break on the prices if they are ordering and I want to use their pets for my artwork.
I guess I have some more research to find out for sure our legalities on this issue.
Great question.