Hi Jan-
What you attempting to do currently for your dog would help manage symptoms of arthritis, but not really hip dysplasia. Depending on the severity of the luxity of the femoral head, you may see little to no difference with what you are doing.
For HD dogs, keeping them lean and surgery are your best options at making them comfortable. The surgery is called a Femoral Head Osteotomy and what is done is that the head of the femor is removed and scar tissue is built up around the femur and acts as an anchor to the acetabulum. Without surgery, his pain will likely get so out of control that he would have to be on pain medication for the rest of his life.
Also just as an aside, it is a falsehood that raw food and kibble should not be fed together.
