The seven classifications of a dog are: Anamalia, Chordata, Mammalia, Carnivora, Canidae, Canis and Canis lupus. The subspecies of dogs is Canis lupus familiaris, which includes feral and domesticated dogs.
According to the American Kennel Club (AKC) there are seven groups all dogs belong to. They are sporting dogs, hound dogs, working dogs, terriers, toys, herding dogs and non-sporting dogs. Each group, even mixed breeds, can be classified in one of these seven groups. Knowing which group each dog falls into can help prospective owners discover the breed that is right for them.
The dog was the first domesticated animal in the world. Scientists believe the dog was first domesticated around 33,000 years ago and have been used by humans in one capacity or another ever since.