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Choose from two different veterinarian-recommended formulas for dogs and cats with arthritis. Each contains glucosamine, perna canaliculus and other ingredients commonly used to treat joint problems. Each comes in a tasty beef/liver flavor.Synovi-MSM contains a supplemental form of sulfur recommended by many veterinarians, plus the powerful antioxidant vitamin C.Synovi G3 brings all the Synovi ingredients together, plus extra antioxidants-rich vitamins, minerals and omega 3 fatty acids.