Poor you.
Remember that shere are more and less serious cases of HD. IF your dog only has a mild version, there may not be necessary with any surgery to have him live a normal life.
Theree are of course a lot of suggestions for what one should do to minimize pain and minimise the bad development of a hip. -for instance
- training should not be over-done, and you should train him very regularly, the same amount of training every day.
- Overweight is particulary bad for a HD dog.

But I guess you get a lot of tips these days... There was a good article in a Norwegian dog magazine a couple of months ago, with a lot of information to owners of HD dogs.
If you like, I might write a translated summary for you.

Good luck!

Marius (Escort Cab + Mark II + Portuguese Water Dog)
Ps. URL for my puppy: http://www.evang.net/neptun.html