The horse (Equus ferus caballus) is a hoofed (ungulate) mammal, a subspecies of one of seven species of the family Equidae. The horse has evolved over the past 50 million years from a small multi-toed creature into the modern large, single-toed animal Humans began to domesticate horses around 4000?years BC, and their domestication is believed to have been widespread by 3000'BC. By 2000'BC the use of domesticated horses had spread throughout the continent of Eurasia .

The coats of a domestic dog are either "double", made up of a coarse top coat and a soft under coat (e.g. a wolf), or "single", with the topcoat only. Dogs with double coats tend to originate in cold climates.

The dog (Latin: Canis lupus familiaris, pronounced /ˈkeɪ.nis ˈluːpəs fʌˈmɪliɛəris/) is a domesticated subspecies of the grey wolf, a member of the Canidae family of the order Carnivora. The term is used for both the feral and pet varieties.

The domestic dog has been one of the most widely kept working and companion animals in recorded human history. Dogs have lived and worked with humans in so many roles that they have earned the nickname, "man's best friend", a phrase unique to them which is used in other languages as well as English.

Cerberus (Greek: Κέρβερος, K'rberos) is the name given to the mythological entity which, in Greek and Roman stories, is a multi-headed dog which guards the gates of Hades to prevent those who have crossed the river Styx from escaping. Cerberus featured in many prominent works of both ancient Greek and Roman literature and in works of both ancient and modern art / architecture.

The cat (Latin: Felis catus), aka the 'domestic cat' or 'house cat' to distinguish it from other felines / felids, is a small predatory carnivorous species of crepuscular mammal that is valued by humans for its companionship as well as its ability to hunt vermin and other unwanted household pests. It has been associated with humans for at least 9,500 years.

Until recently the cat was believed to have been domesticated in ancient Egypt, where it was a cult animal. However, a 2007 study found that the lines of descent of all house cats probably run through as few as five self-domesticating African Wildcats (Felis silvestris lybica) circa 8000 BC, in the Near East region.

Cats typically weigh between 2.5 and 7'kg (5.5'16?pounds). Some breeds however, such as the Maine Coon, can exceed 11.3'kilograms (24.9'lb). Conversely, some very small cats (less than 1.8'kilograms (4.0'lb)) have been reported.

Rabbits are small mammals in the family Leporidae and are found in many parts of the world. There are seven different genera in the family classified as rabbits, including the European rabbit (Oryctolagus cuniculus), Cottontail rabbit (genus Sylvilagus; of which there are 13 species), and the Amami rabbit (Pentalagus furnessi, an endangered species on Amami Ōshima, Japan). There are many other species of rabbit, and these, along with pikas and hares, make up the order Lagomorpha.

Horse breeds are divided into three categories based on the animals' general temperaments: spirited "hot bloods" with speed and endurance; "cold bloods", such as draft horses and some ponies, suitable for slow and heavy work; and "warmbloods", developed from crosses between hot bloods and cold bloods, often focussed on creating breeds for specific sporting or riding purposes, particularly in Europe.