A few things might help --
Glucosamine and chondroitin are both supplements -- chondroitin is a bit more of the anti-inflammatory but both are essentially going to hydrate connective tissue (the cartilage that is there) - literally it plumps up that cartilage so it cushions better.
That works pretty well -- some even like to use it as a preventive measure -- as long as there IS sufficient cartilage there to "plump up". The other thing is - if you stop using it, it stops helping. It's not a pain reliever -- it simply cushions better so there is less rubbing of bone on bone (which is part of arthritis -- only the bone itself actually becomes inflamed).
However -- you might want to also consider something like Knox NutraJoint -- it's another supplement -- mostly it's bovine cartilage and calcium and some minerals. It essentially puts the "stuff" (the building blocks) at the body's disposal so it can *re-build* cartilage that has worn away (which often happens when there has been damage).
I've used Knox NutraJOint on ME and on the dogs for several years (and several different dogs) with extremely good success. It's not a tempoary fix -- but rather it helps actually re-build cartilage.
Knox NutraJoint website -- Now they also have a product that has both Knox NutraJoint AND glucosamine/chondroitin in it -- and truly I've never used it. The NutraJoint alone has always worked really well for me (and it's not at all expensive).
It takes 2-3 months for NutraJoint to reach maximum effectiveness -- because there is a re-building process going on, not just temporary avoidance of pain.
However -- in honesty, before you do a lot of stuff like this, you truly should consult a vet who can specifically address this problem.
And I really don't mean a "regular" vet. In my experience, TCVM (Traditional Chinese Veterinary Medicine) -- with the use of acupuncture and herbals -- is INCREDIBLE to help this sort of problem.
This is *not* instead of going to a regular vet, but rather it's a compliment to it. If you want to let me know the zip code of where you're going to be here in FL I can probably connect you with a good vet. The Chi Institute headquarters is in Reddick (up near Gainesville) and we're really fortunate here to have some awesome TCVM vets in the whole state.
Acupuncture is particularly good for several things -- it's incredible for pain management (which is how I, personally, got connected to it -- and it was a vet who steered ME towards acupuncture for my own arthritis). But it's also superior for healing -- even an old injury that has not quite healed properly can benefit in a big way from acupuncture.
It does not hurt at all -- in fact, if you go to the video section on the board you will see a video I put up of Billy getting needled by Dr. DiNatale - it's just a typical session and it's pretty obvious he's not in any distress (other than hoping for Tom the Tech to come by and give him more treats?? Except that happens AFTER the session *grin*).
The exam that a TCVM vet gives is completely unlike anything else -- yes, they'll look at x-rays or anything else you care to bring, but that's not their primary diagnostic tool. They put their hands all over the body -- feeling for heat, resistance, and how the blood courses thru the body to identify areas of injury or sluggishness.
Dr. Roger Clemmons, up at the University of FL is known all over the world for his work with GSDs (particularly with DM). He's the head neuro-surgeon at the University -- and he also teaches at the Chi Institute. They actually teach acupuncture (and herbology) at the Vet School -- but he's found ways to use it in neuro cases that are amazing to see.
http://www.tcvm.com -- there's a locator on the left. Because I've had several dogs up to Gainesville for treatment (and because I know Dr. Clemmons and Dr. Xie and several ot the other vets on the faculty) I'm glad to help you find someone if you want. Not every holisitic vet is a "good" one. But finding a good one isn't as diffficult as you might think.
Let me know if I can help. But honestly -- before you try a ton of supplements, getting a good diagnosis to begin with so you can address the particular sore point would be the best place to start.
I know Amanda's vet does a LOT with acupuncture with Bevo (and with her other dogs) if you want to check it out with others. But holler if you're interested. And good luck!