Where do I post a request for pictures of pets and their owners for my book I am writing?

I need 366 pictures of pets and their owners. I have a waiver for them to electronically sign. They won't receive any money, but a copy of the book if I use their picture. Can i post on this site and any other sites like FB, LinkedIn, etc? Pls. give me advice and your thoughts on this.Where do I post a request for pictures of pets and their owners for my book I am writing?You can post it on this site, but it might get deleted. You could post flyers in pet shops or vet offices.