Pete Rickard's Trailing Scent contains natural extracts to effectively condition your dogs to trail game. Pete Rickard developed the scent and scent training method in the 1940's. The Rickard trailing scents have stood the test of time. More than half of a century of proven performance in dog training has made Pete Rickard products known around the world. Available in 1 1/4 oz. and 4 oz. bottles. Comes with instructions.