Zylkene Nutritional Supplement For Dogs And Cats is an excellent product that helps support balanced behaviour in pets. It also helps pets stay relaxed in difficult or uncertain situations. The product is lactose free, non-drowsy, and has no known side effects, thus it is safe to be given to all kinds of dogs and cats. This nutritional supplement is really helpful during challenging events such as travelling, loud noise, new people, separation, vet visits, introduction of new pets, parties and fireworks.