Blackdog Shark Cartilage treats are a natural chew sourced from shark spine, providing glucosamine and chondroitin in a minimally processed form. They suit dogs of all breeds, particularly those with joint stiffness or arthritis.

The cartilage is salvaged from sharks as a by-product of the fishing industry, then dried with minimal processing and no additives. Glucosamine and chondroitin — found naturally in cartilage tissue — are commonly associated with joint cartilage support in dogs. The chewy texture also provides some incidental dental benefit as dogs work through each piece.

Owners with older dogs or breeds prone to joint issues often use these as a functional supplement that doubles as a treat. The single-ingredient format and natural sourcing are the main reasons they keep coming back to this one.