Zylkene is a behavior supplement indicated for both dogs and cats for either short-term situational stress or longer term for chronic anxiety. Working as a GABA agonist, Zylkene produces a calm sedation without the side effects that are seen in pharmaceutical GABA agonists. It utilizes a natural occuring bovine milk protein called alpha-casozepine. 14 count blister pack. Capsules may be 'pilled' or opened and sprinkled on food.