i agree with kate. It is a purely a cosmetic surgery that isnt better or worse for the dog itself. It is up to the owner of the pup. There is some pain and discomfort for the first few days after the surgery, but then it isnt too bad after that. As for the breeder i dont see why they would make it mandatory to crop the dog, especially if it is sold as a pet. I have never heard of a breeder with this kind of requirement, but that doesnt mean there isnt one out there.