A cob is traditionally a small horse, usually of a stout build, with strong bones, large joints, and steady disposition; it is a breed of horse. Historically, in the United Kingdom and, to a lesser extent, the eastern United States, a 'cob' may be a common horse used for everyday riding but in the past was used for driving carts.
The term continues to be widely used to describe this breed of horse in the United Kingdom, but less so in North America. In the United States, the term "cob" is primarily used to describe the Welsh cob, and in the sizing of bridles for horses, designating a smaller size that will fit not only the Welsh cob, but also many Morgans, Arabians, some American Quarter Horses, and other horses with short, triangular-shaped heads.
In general terms, cobs are larger than ponies, standing 14.2 hands (58 inches, 147 cm) or taller, but are relatively small and compact, usually with somewhat short legs. The breed of horse known today as the Section D Welsh cob exemplifies the classic build of the historic cob. It is said that good show cob should have "the head of a lady and the backside of a cook."
Popular uses of the cob include driving, showing and recreational riding. Cob-type breeds have become increasingly popular for Riding for the Disabled Association (RDA), as well as for riders who seek horses who are responsive but with a calm temperament, shorter stature and steady, comfortable gaits.
The rulebook of the British Show Horse Association (BHSA), states: "The Cob is a type rather than a breed. A short-legged animal exceeding 148 centimetres (14.2 1⁄2 hands; 58 1⁄2 in) with a maximum height of 155 centimetres (15.1 hands; 61 in), it has bone and substance with quality and is capable of carrying a substantial weight...Cobs should have sensible heads, (sometimes roman nosed), a full generous eye, shapely neck crested on the top, with a hogged mane and well defined wither...The Cob should also have clean, strong hocks and all the attributes of a good hunter."