Anyone have much experience with them? Schaffer just got back from the vet. He has chronic anal gland issues, but we all knew that... XD (The vet said to just feed a bit of canned pumpkin.) The fluff but has had some problems with his hind legs, though, and it seems to be catching up to him now that he's ten. The vet recommended glucosamine or chondroitin. Anyone use either? What are some good brands that carry effective but not bank-breakingly expensive joint supplements? Any help is great.