A black horse is black in colour with black points and a black muzzle.
A brown horse is dark brown in colour with black limbs, mane and tail.
A dark bay horse is mid-brown in colour with black points.
A bright bay horse is mahogany in colour with black points.
A bay-brown horse is where the predominating colour is brown with bay muzzle and black points.
A dark chestnut horse is a rich red in colour with matching points. He sometimes has small patches of black hair on the body. He may be whole coloured as in a Suffolk Punch but is more likely to have white markings on his legs.
A chestnut horse is a paler version of the above and may have a flaxen mane and tail.
A liver chestnut horse is a darker shade verging on brown with darker points.
A grey horse is one with both black and white hair growing in the coat with matching points, mane and tail. The skin is black.
An iron grey horse has predominantly black hairs and can be mistaken for a black.
A light grey horse has predominatly white hairs.
A flea-bitten horse is grey with spekles of dark hair growing over the body. It usally happens in older horses.
A dapple grey horse has circles of black hair growing all over the body.
NOTE: All grey horses become lighter with age, but are NEVER described as white because on close examination you can see that the skin is black. All white horses (includeing skin) are called Albinos.
An Albino horse is one whose skin is white or pale pink. The skin is lacking in pigmentation, the coat is white. It is a very unusal condition.