I don't like dewclaw removal, but I'm not going to argue with someone who wants it done. I really really don't like declawing cats at all. I'd take the declawed cat over the one dumped at the shelter for scratching the house up though. I can't own cats at this point, so that's moot.
I personally don't care one way or the other about docking/cropping your own pet. If it's docking, obviously taking an adult dog in to have a dock done is stupid if it's strictly for cosmetic reasons, and I'd hope the vet would try to educate on the pain that comes with removing a fully grown and developed appendage. If it's for something like chronic happy tail, then yes, I'd rather see the dog docked than given up.
I really prefer the dogs with the short/working crops vs natural ears. I think if my brothers boxer had been cropped, she'd have WAY less issues with her ears than she does now. Lack of air flow/hematomas in the ear, bacterial infections, ect. I think cropping would have eliminated a lot of those problems. She's on an excellent food, and her allergies are food based, not environmental, so it must have something to do with her huge heavy ears.
Though on breeds like Dobes, I absolutely love the long show crops, done correctly, like on Sizzles and NRAs dogs. I'd drive a very long way to have my puppies done by whomever did their ears vs letting some local vet try to pull that type of artwork off. It's supposed to complement the individual dogs head, and that's not something every vet can do.