These horses derive from various varieties of the diluvium western horse (Equus robustus), with which they have many osteological similarities in which they significantly differ from the eastern horses derived from tarpan (Equus Gmelini).
The domesticated western horses are of greater massiveness, heavier in body but also more lymphatic. Their head is somewhat large in proportion to their body, heavy and rough. The bigger size of the head is contingent on their longer facial part rather than on brain size proportion as it is by the typical eastern horses. The head profile is either straight, or slightly protruded/bulged or only “Roman” nosed; the neck is thick/heavy, wide and low set, thus the withers is barely visible; the back line is long, more or less swayed; the loins are longer (6 vertebrae more), the hips/hindquarter are more or less slanted and by less refined breeds short. The front end, as well as, the hind is wide. The legs are thick/heavy and often lymphatic, the back of the pasterns and shins has long hair. The skin is thick, the hair on the body, mane and tail is rougher, plentiful and often curly. Form the physiological perspective the coldblooded horses habitat is muscular combined with eating/food, and a complex with lower oxidation, which is the reason for gaining fats easily, for being early maturing and of calm character.
All coldblooded breeds were variously crossbred with constant selectiveness, inbreeding and positive adjustments to the living conditions and environment.