Thanks Kris. With Max, you can see a tiny spur on his kneecap (probably arthritis) and the vet said she saw some mild inflammation, but I'm not convinced Max has a knee issue - I think his pain and reluctance to stand on that leg is his back or his fistula. It's a mystery, and i'm not sure what to do yet. He has the most perfect sit still.

I took him to a rehab place, and she wasn't impressed with either of his knees. I would like to get back there if I can get him more stable in other areas.

The arnica would help if it's a strain, and perhaps in any case of tissue damage. I would give the 30C potency, 3 tablets, a couple times a day for about 3 days, and then drop to daily for about a week and then reevaluate.

Glucosamine, chondroitin (if there are no digestive problems), hyluronic acid, msm, cetyl myristoleate...all good stuff.