Ox

These animals fit into the same category as draft horses -- they pull large objects but aren't necessarily ridden.  Oxen are less intelligent than horses but are also less skittish.  Like mules, they can get by on grazing alone.  Their speed and carrying capacity are somewhere between that of a horse and a giant snail. They are hardy and handle most climates.  Like draft horses, they are often sold in pairs.  They also make good use in agricultural settings.