A chew toy is designed to be chewed by animals for purposes of stimulation and relief from boredom. The act of gnawing on a chew toy is meant to be soothing and to assist small animals, like puppies, in event of easing the pain when breaking in their adult teeth as the chewing process releases feel-good chemicals from the brain. There are several different types of chew toys, including rawhide, wood, paper and mineral. Chew toys are commonly associated with dogs, though they are also used by birds, rodents, and rabbits.