I may be wrong about this but dont' they usually crop puppies tails when they are only a few days old? How old is your pup? I'm guessing at least 6-8 weeks old? I find tail docking and ear cropping an unnecessary procedure...it's painful and just for cosmetic purposes. So in my opinion there is no reason that her tail must be docked and it will not physically hurt her to keep the tail she was born with. I've seen several aussies with natural tails, it's cute!