They have vets that give them MSM to relieve soreness. MSM is short for methylsulfonylmethane – got that? Several studies have found humans can also have pain relief by taking MSM capsules or powder. One study found an 80% reduction of osteoarthritis pain in patients taking 2,250 mg per day of MSM (You can take as much as 8,000 mg with no side effects. It also seems to relieve chronic headaches and back pain).
You'll need to give the MSM an extended period of time to begin working and if you combine it with glucosamine and chondroitin sulfate, you'll really up its effectiveness.