Dog

            Dogs are animal that have lived with people as pets for more than 10,000 years; longer than any other animal. During that time, breeders have developed about 400 breeds to perform various tasks, such as providing companionship, and pleasing the human eye. Some dog terms are," Bitch", is an adult female dog, Breed standard is an official description of a breed. Canine is another word for dog or doglike. Dog is an adult male canine.
             Litter is a group of puppies born at one time to one female. Tail chasing is a normal form of play for puppies. Digging is an instinctive activity that dogs retain from their wild ancestors. Panting helps a dog stay cool. When saliva evaporates from the tongue and mouth, it has a cooling effect that helps reduce the dog's body heat. Unlike people, dogs cannot cool themselves by perspiring. They have sweat glands only in their feet, and the glands have little effect on body temperature. Body structure is primarily determined by the dog's skeleton which has an average of 320 bones. The exact number of bones varies depending on the length of the dog's tail. A male dog has one more bone than a female of the same breed. .
             He also has a bone called the "os penis" in his penis. A dog's most highly developed senses are those of smell and hearing. Dogs can smell odors that the human nose is unable to detect. A dog can pick out an object that has been briefly held by a person from a group of identical objects that have not been touched.
             Sporting dogs were developed to assist hunters who use guns. Breeds in this group are also called "gundogs". They include pointers, setters, retrievers, and spaniels. Working dogs includes breeds developed for guarding and hauling. A mother nurses her puppies until they are about 6 weeks old. Most litters consist of 1 to 12 pups, but litters of 15 or more have been reported. These dogs are Chesapeake Bay retrievers. .
             There are reasons why dogs chase their tails, dig, eat grass, and pant.