Corgi Tail docking and etc.

Hello, I'm actually going to be trying to adopt a corgi but I heard most Corgi's are born with tails. I looked into some breeders who guarantee they dock tails and cut dew claws. Have you heard of any breeders who don't do this to corgis?
Preferably in Wisconsin? And, why is it so important? I don't plan to show my dog, but care for him and do my research about what he'll need.