My DMH ever since I got him last august always gets poopies stuck to the fur around his bum and down his back legs. He has been on different food and nothing has changed, and I also trim the fur around there and try and keep it a bit shorter. But it still seems that every few days or so I have to stick his but under the tap and clean him off. Any suggestions? DSH does not have this problem, is it because of the length of the hair?