I had a Springer that was diagnosed with hip displaysia at 2 YO, and lived to be 17. Her's was about the same severity. I first started her on Glucosomine (sp?), watched her weight closely, then gave her one baby aspirin if she seemed in discomfort. As long as I didn't let her run too much, and make any fast turns, she did pretty well. As far as exercise, swimming during the warmer months seemed to be the best.