Normally, adult pets defecate once a day if they are fed once a day, and twice a day if they are fed twice a day. Puppies and kittens defecate more often because they are fed more often. In dogs and cats, normal stool is large enough, and firm enough, to push against and empty the two glands situated in the rectum. These glands, also called anal sacs, discharge a malodorous material onto the stool that provides special signals for other pets.