I know someone who got asked about declawing and tail docking. For declawing, he said that in general he doesn't agree with it and would like clients to try other things first, but as a last resort (i.e. the cat will be given up to the SPCA if nothing is done) he would declaw. For tail docking, he said that he would not do it to comply with breed standards, but would if it was medically necessary (i.e. "happy tail syndrome"). While I would agree with this view, you could also take the stance that you would declaw/tail dock/etc., as long as you can defend your point of view from a medical perspective. I'm sure there are a lot of dog breeders, for example, who would disagree with me, 🙂 and you could argue that it's better to have the procedure done in a hospital setting with sterile instruments, etc.