A highly dangerous carnivore covered in thick reddish-brown hair, having five clubfooted legs and a low-slung body. It has a particular taste for humans (FB).
One of the most dangerous of magical beasts, the quintaped is found only on the Isle of Drear off the north tip of Scotland. There is a fascinating legend about the origin of quintapeds, which involves a feud between two wizarding clans and a poorly thought-out magical attack. The reader is urged to read the full account in a reputable source such as Fantastic Beasts and Where to Find Them by Newt Scamander. The Isle of Drear has been made Unplottable to protect the unwary (FB).
In the Room of Requirement, Harry discovered a cage which had the skeleton of a five-legged creature in it. Harry didn’t recognize it, but this was likely a Quintaped (HBP24).
"quintaped" translates from Latin as "five-footed"
The quintaped has a fascinating backstory, the full of which can be found in Fantastic Beasts and Where to Find Them, and can be considered a warning against duels, drunkness, enimity and family rivalry, revenge, and not thinking things through.