Baloo, our 17 month old Border Collie, has been shedding profusely since about March of this year when he turned a year old. Before that, we found little to no dog hair around the house. At first I thought he was losing his winter coat, but this has been going on for 5 months now. I figured there would be some shedding, but he's throwing out big locks of fur. For all the shedding though, he has no thin or bare spots. He had a checkup and full blood tests before his neutering in June and the vet says he is healthy. We have had him on Solid Gold Hundchen Flocken, which contains fish meal and salmon oil, since the day we got him in July of 2007. What am I missing?