I agree with docking because it seems to me that the breeds that have their tails docked are very excitable breeds can can hurt their tails very easily or hurt a child with that whip of a tail. I read a story about an undocked doberman that blinded the eye of a three year old child with it's tail.

I don't agree with cropping ears though. There are no medical reasons to do something like that. Personally I think that some breeds look better with their ears cropped, like dobies, but think about it. You are putting a dog through anesthesia, cutting off part of it's ear and stitching it up, all for the sake of look.