Helps Your Pet Cope with External Stress - Zylkene will help your pet cope with changes in their daily routine, such as travel, celebrations, vet visits, home alone, boarding, loud noises, and more. Alpha- Casozepine - A naturally occurring milk protein found in cow's milk that helps promote calming effects in your pet without drowsiness or other side effects found in other calming dog treats. Lactose-Free and Easy on Sensitive Stomachs - Zylkene's dog calming and cat calming supplements are lactose-free and made with natural ingredients that are easy on sensitive stomachs. Decreases Stress Reactions Within 90 Minutes - Zylkene promotes calming in dogs and cats within 90 minutes, for chronic cases, the first effects are observed in the first fifteen days