Chocolate, the appendix QH we are feed-leasing appears to have arthritis in his hips, hind legs. He moves pretty stiffly for the first 5 minutes when we ride, then seems to loosen up and in the past at least, did fine. I have him on MSM and recently added yucca.
He has been a really nice horse for my younger daughter to use and because he does have nice gaits, my older daughter was considering using him to attain the next rating level in Pony Club which means jumping 2' 9". In the last month, he has starting "misbehaving" by crowhopping, wringing his tail and sometimes bolting when cantering and jumping (12"-2'). We also noticed his saddle was suddenly hitting his withers and he just seems to have lost condition in his back/loin area. We corrected the saddle fit but it didn't help with his behavior. I upped his hay, added some beet pulp to help with his condition without making him hot.
Yesterday an equine acupuncturist checked him out and he was very sore from his hips over his rump and down his hind legs. She gave him a treatment and it was evident he felt better. She said the loss of condition is due to pain and his behavior makes sense to us now. He will get another treatment next week.
My question is, aside from things like MSM, yucca, exercise, what can be done to help a horse like this long-term? He is a feed-lease so I obviously do not want to spend an arm and a leg and having arthritis myself, I know there are flare-ups and times when I'm fine. Are there arthritis meds for horses that aren't that expensive and are legal to use and compete?