Cats and dogs are related on five levels: they are both members of the domain eukarya, the kingdom Animalia, the phylum Chordata, the class Mammalia and the order Carnivora. Cats belong to the family Felidae and dogs belong to the family Canidae. Cats and dogs belong together since they have a common ancestry. They are related to a wide range of other species, both huge and little. The genus of a cat is Felis. And the scientific name of dog and cat is Canis lupus familiaris and Felis catus respectively.