I have three bull dogs, a mother and two one year old pups.Two have great coats. One has sporadic long hair. It has not always been like this. It has been real wet here this summer. I do not know if that has anything to do with it or not. First I thought worms but I deworm monthly. Years ago I had something similar but I cant remember what the vet gave me. ( It was do ta damp conditions) any help!