I dont agree with it either, Ripley has a short tail but we have no idea if its natural or docked, since we did not get him till he was 8 months old. but bob tails also come up naturally in breeds thats not normal for it to happen. one sheltie breeder I know had a sheltie born with a bob tail, as well as blair little brothers 2 out of the 3 have bob tails, one was docked for medical reasons and the other was born with a natural bob tail which is highly unusual in the breed.