The Sentry Calming Cat Collar is a great option for behavior management that works within 30 days. The pheremones that the the collar releases effectively treat behavioural problems in pets due to stress, anxiety and phobias. It also helps rescued or adopted cats ease into their environment. It is a safe option that removes the need for prescription medication with less long term side effects. It can also be used on both dogs and cats of all breeds and sizes.