This is a great thread, Danefaith!
Did the puppies age up with the curled tails? Did they have the curled tails when they were babies? I've had two Chows breed. Both have the curled tails and none of the first three puppies had their tail. I went into CAP to fix it. I have a fourth puppy now and no curled tail on him, either. I was starting to think that little puppies can't have a curled tail at all, then they age up with the tail they were born with, which isn't curled as an adult, either.