Composure Pro feline formula is a clinical strength calming supplement for cats. It typically works within 30 minutes and lasts up to 4 hours. Composure Pro combines four effective including Colostrum Calming Complex, L-theanine and L-tryptophan to provide advanced behavioral and cognitive support. Composure Pro is recommended for traveling, thunderstorms, fireworks, veterinary visits and routine changes. These chicken liver-flavored chews are perfectly sized for cats with added flavoring for picky eaters.