[anonymous]

Umm, if the dog is in chronic pain (due to hip anomalies confirmed by x-ray) then forcing him to exercise may not be a good idea.
Pain management may be a priority.
Again, the expertise of a veterinary healthcare professional that has examined the dog is indicated (imo).

Also, starving the dog so that he will lose weight is not a good idea either. I hope the poster is able to work with the vet and come up with an effective treatment plan.