The ass sometimes has very distinct transverse bars on its legs, like those on the legs of a zebra.
It has been asserted that these are plainest in the foal, and from inquiries which I have made, I believe this to be true.

The stripe on the shoulder is sometimes double, and is very variable in length and outline.

A white ass, but NOT an albino, has been described without either spinal or shoulder stripe; and these stripes are sometimes very obscure, or actually quite lost, in dark-coloured asses.

The koulan of Pallas is said to have been seen with a double shoulder-stripe.
Mr.Blyth has seen a specimen of the hemionus with a distinct shoulder-stripe, though it properly has none; and I have been informed by Colonel Poole that foals of this species are generally striped on the legs and faintly on the shoulder.

The quagga, though so plainly barred like a zebra over the body, is without bars on the legs; but Dr.Gray has figured one specimen with very distinct zebra-like bars on the hocks.
With respect to the horse, I have collected cases in England of the spinal stripe in horses of the most distinct breeds, and of ALL colours; transverse bars on the legs are not rare in duns, mouse-duns, and in one instance in a chestnut; a faint shoulder-stripe may sometimes be seen in duns, and I have seen a trace in a bay horse.