I am having an issue with one of my llamas. He is a guilded 10-12 yr old (best guess) that I rescued 2 years ago. He is having problems with his back legs. He is eating, drinking, peeing, and pooping. He can get up for small periods of time. I have been giving him Banamine for the past 2 days, but know that is not the solution to my problem. My vet says it's arthritis. Is there a supplement that I can get to keep him with us longer?