Bark & Whiskers Collagen (Dr. Mercola Organic Collagen Cats and Dogs)Collagen is the most plentiful protein in your pets body it makes up as much as 30% of his or her bodys total proteins and 70 to 80% of the protein in skin. Found in the connective tissue throughout the body, collagen provides the structural scaffolding for tissues to maintain their integrity and flexibility. Collagen supports the integrity of your pets muscles, bones, tendons, ligaments, blood vessels, digestive tract and skin. It plays an essential