One of the best things for dogs with hip dysplasia, is Glucosamine with Chondroitin and Cod Liver Oil capsules.
My German Shepherd was diagnosed with HD when she was 8 months old and she is now just 3yrs old. She still runs about & plays like a puppy with no significant pain symptoms. Unfortunately, after an xray two weeks ago, it showed the degeneration of her hips is quite severe now, so was referred to the Small Animal Hospital at Liverpool University and it's been decided that she will have to have total hip replacement done.