My 4 year old GSD was diagnosed with severe HD a few months ago. It was so bad, that the vet basically said my dog shouldn't be allowed to do anything anymore other than go for 4x 15 minute walks a day and avoid concrete/asphalt surfaces (and switch to Hills J/D diet... ugh). At least he also told me to give a product called Doils, which is medical grade Omega 3 with higher EPA and lower DHA, vs. regular salmon oil which is higher DHA and lower EPA. EPA is what the dog supposedly needs for their joints. It also contains Vitamin E, but in low doses so I supplement that myself in gelcap form.
I spent much time looking into the options and having knowledgeable friends give their input and look at the x-rays for me.
I asked my vet, as well as the ortho specialist, about Adequan, Cartrophen Vet, Gold Bead Therapy, and Acupuncture.
Nobody in Belgium has ever heard of Adequan, but it is my understanding that Adequan is basically glucosamine injections, and in Europe the alternative treatment is Cartrophen Vet, which is supposed to be an EXCELLENT product, but has not made it through the FDA yet in the US (but is available in Canada).
My local vet found how to get ahold of Adequan, but the product itself would cost some $600 to get ahold of here, vs. $200 for Cartrophen Vet (which likely came from the UK, and I am still not quite sure if it is approved for use in Belgium, but whether it is or not, they are able to import from the UK for me...)
So I did the once a week x4 week treatment of Cartrophen. I give the Doils + Vit E, and I use the SynFlex liquid Glucosamine product (I believe Leerburg sells this too).
Hydrotherapy/Swimming would also be excellent, but I haven't gotten a chance to do it yet with my dogs $75 a session here... and no natural bodies of water that I can use, my dog is not a big swimmer, so I need something where I can coax him/pressure him to go in a little at first before he'll do it on his own).
To me, the conclusion I reached is that quality of life is more important than anything else. If I were to follow my (specialist) vets advice, then I would be feeding Hills, giving the Doils, and not letting my dog do anything other than walking on a tight leash. I chose to ignore it, I let my dog play in the yard and chase bugs, I let him play with Lyka, I let him just be his happy self and let him limit his abilities himself. He doesn't show many symptoms of HD, I notice he is a little stiff, but that could be the hernia in his spine more so than the HD for all I know.
I figure worst case scenario, he gets hip replacement surgery and he's 100% back to normal. Best case scenario, good nutrition and supplements, annual Cartrophen Vet shots and he will never have any issues.
Good luck with your dog, I know that first diagnosis can be quite the "hit," but once you get used to it and look at it objectively it's not so bad and you deal with it as it comes. Your best decision was to ask here instead of listening to your vet. I am told vet's are often doomsayers when it comes to HD and they like to push crap in a bag (Hills) a lot.
PS: My ortho specialist wasn't keen on the Cartrophen Vet treatment, they said it was "very expensive" and that they have had the same results with the Doils Omega 3 product as they did with the Cartrophen Vet. I got the impression that he was not speaking from experience, and "very expensive" isn't accurate either. Had I gone through them, I am sure there would be a hefty markup on the product, plus $70 consultation fees for each of the 4 injections. But my local vet got me the product for less than $200 and charged me $30 for the series of 4 injections. Then they gave me the rest of the bottle, which is good till 2010, and has enough in it for another 4 week round of shots. Sometimes you just gotta ignore the vet and keep on pushing till someone does what you want them to do. Luckily your vet is recommending Adequan, and I would definitely go that route since it is available to you.