I give my dogs that are training heavy or competing a couple of things.
Petie gets Salmon Oil, which provides extra fat in the system and in a natural mild anti inflamatory.
He also gets Chondrontin/MSM (because he does have a mild problem in his pelvis) but he only gets it when we are competing heavily, not year around.
He is also given Elkhorn, which is a natural anti inflamatory but in low doses.
This is all done with the advice and approval of his Sports Medicine Vet who is Holistic/Chinese Medicine and is also a Chiropractor. He is given chiropractic adjustments (mild adjustments) at least once a month when we are competing and he LOVES it, especially the massage at the end
He is very hard on himself and very fast, he wouldn't have remained sound for this long (8 yrs) if I didn't do all this and more.