Natalie
I have had GSD's for the last 50 years-yep I'm old. Several have had hip problems.
With Tico, our current rescue GSD we have found that the Synovial G-3 helps him much more than the straight glucosamine and chondroitin. I mentioned this to my vet and she said other people have has similar results -the added MSM,fatty acids, antioxidents, etc seems to make a real difference.
Another friend has found that the Adequan injections to be very effectgive with thier dog. I think there is a thread on this in the Health and Genetics section. I think I will try this, if the Synovial G3 stops being effective.
Another frend had very small gold beads injected in her dog. He was diagnosed with HD as a young dog and is now 12+ and has just started showing stiffness and soreness. She found a vet in Indiana that used this procedure.
Good luck.
Donna