dark line running down the horse's spine

Coloured stripe (usually black or brown) running down the back of the horse - from the mane, continued into the tail.

Dark hairs extending down the back towards the tail

A continuous stripe of black or brown hair from neck to tail. Seen in horses of "primitive" breeding, such as the Exmoor and the Norwegian Fjord and is often seen in dun-colored horses. (Also called Eel Stripe)

A black stripe down the back of the horse