Give Zylkeneâ® 1-2 Days Before A Predicted Stressful Event Or Change In Environment. These Short-Term Triggers May Include Firework Displays, Thunderstorms, Being Home Alone, Travel Or Boarding, Moving To A New House, A Trip To The Groomer Or Vet. Zylkeneâ® Calming Supplements Are An Ideal Choice To Help Support Your Cat Or Dog In Challenging Situations.