Calming Collar For CatBeaphar Calming Collar for cats effectively reduces problem behavior arising from stressful situations in cats of all breeds and ages. Using safe and natural ingredients that are slowly released over a period of 3 4 weeks, it leaves cats feeling calm, settled, relaxed and reduces problem behavior. This can be especially important in a multi cat (or pet) household as cats are particularly sensitive to other animals and changes in their environment.