Trope-a-Day: Horse of a Different Color
Horse of a Different Color: The cerrúr is a four-horned, hexapedal, browsing animal, but it fills much the same niche as the horse, as historically early basic transportation/power and later prestige transportation.
Despite much wishful thinking and a few attempts, no-one ever managed to breed a bandal large enough to create an actual riding dog. There have, however, been some attempts to engineer flying mounts, mostly limited to gas giants and low-gravity moons.
Do Not Ask About The Bear Cavalry.