I plan on buying some MSM to help keep things reduced and blood flowing after work outs, but Harry is a 4 year old TB with a small chip in his knee. Xrays have been done, and he's perfectly sound for low impact work like trails, which is what I wanted. The vet did comment that we may see some arthritis in the knee later, and suggested that if it worried me she could do surgery to clean things up and try to prevent that. I'm not ready for surgery, but I'd like to know what you guys suggest as far as joint suppliments go? His knee does click.