For years the domestic dog was classified as a species, Canis familiaris. However, recent DNA analysis shows domestic dogs evolved from wolves, Canis lupus. This led scientists to reclassify the domestic dog as Canis lupus familiaris, a subspecies of the wolf rather than a separate species

Domain- Eukarya
    Kingdom- Animalia
        Phylum- Chordata
           Subphylum- Vertebrata

                Class- Mammalia
                    Order- Carnivora
                        Family- Canidae
                            Genus- Canis
                                Species- Canis lupus
                                    Subspecies- Canis lupus familiaris


Different breeds of dogs. Public Domain:

Domain Eukarya
Organisms have cells with a true nucleus and membrane-bound organelles.

Kingdom Animalia
-Organisms are multicellular with no cell walls and are heterotrophs.

Phylum Chordata
-Organisms possess notochord, postanal tail and pharyngeal pouches at some point during their life cycle. Organisms have bilateral symmetry, segmented bodies, developed coelom, dorsal nerve cord, closed circulatory systems, complete digestive system and an endoskeleton.

Subphylum Vertebrata
-Organisms have a vertebral column or a backbone. They move due to muscles attached to their endoskeletons. These organisms also have a digestive system with large glands (pancreas and liver) and a ventral heart with 2-4 chambers.

Class Mammalia
Organisms have 3 middle ear bones, hair, and produce milk from mammary glands.

Order Carnivora
-Organisms primarily eat meat. They have 4 to 5 toes on each leg or arm and have sharp canine teeth.

Family Canidae
-Organisms have elongated feet and legs, 5 toes on the forefeet and 4 toes on the hindfeet, non-retractile claws, and usually form packs with strict social hierarchy systems.

Genus Canis
-This includes wolves, coyotes, jackals and domestic dogs.

Subspecies Canis lupus familiaris
-Canis is the Latin word for dog. Domestic dogs are ancestors of the grey wolf.

 Phylogentic Tree showing the different breeds of dogs. Public Domain:

To learn more about a dog's habitat, click here.