We use Sea Mobility. We tease that this is "crack" for dogs.
They will do just about anything for it. It is a product w/sea cucumber, chondroitin, msm glucosomine w/56% premium human grade beef. I knew we needed a treat that they would love consistantly. fThough not recommended for diabetes or any metabolic disorders causing hypoglycemia.
It is endorsed by the National Animal Supplement Council & vet recommends. It's aby Ark Naturals out of Naples FL. It is NOT cheap. $13 for 9oz which is 22 sticks.
One stick per 50lbs so we take it & break it into pieces, since no one at this time is over 5.5lbs.