Sentry Calming Collar for Cats, Long-Lasting Pheromone Collar Helps Calm Cats for 30 Days, Reduces Stress, Helps Calm Cats from Anxiety, Loud Noises, and Separation, 3 CountFor more than a decade, SENTRY has worked side by side with leading pet experts and top universities researching effective ways to help pets lead happier, less stressful lives and to strengthen their bonds with their owners. SENTRY Calming Collar for Cats quickly releases a pheromone through an easy to slip on collar that helps alleviate problem behaviors triggered by travel, thunderstorms, visitors in the home, and even introducing a new cat into the