I don't know if you've heard of Bioflow collars, I've had some excellant results with them for some of the dogs I've walked in my time, I used to walk a Golden retriever who at 7yrs old developed arthritis after having both her cruciate ligaments operated on, I told the owner about these collars and she bought one, 2 months after wearing it Katie was running around like a pup, his was without any medication, she lived until she was 14 with no more problems with her legs. As far as I know they give you your money back if it doesn't work within a couple of months, worth a try I would say. Google Bioflow, lots of information on their site.