Our vet put Bear, who has had bad joint/arthritis since we got him at 5 yrs on a suppliment of glucosomine/chondroitin. We use the human variety, she gave me 3 brands that were good, I don't off the top of my head remember the other 2, but he gets the Kirkland brand (Costco). I don't have the bottle in front of me but I think it says glucosomine/chondroitin 500/400 mg. He gets 1 pill twice a day. Your vet should be able to give you the correct dosage for your dogs weight over the phone. I've started to put Hunter on this as well since he's starting on agility, I figured it can't hurt.