Also known as Lobisón or Luisón, this is the Hispanic American version of the werewolf. According to tradition, the seventh male son becomes a lobizón. However, there are different variants of this belief.
The lobizón is sometimes a mixture of dog and pig, and the metamorphosis takes place on Fridays. The lobizón makes its way to dunghills and henhouses to eat excrement. It also devours unbaptized children. If a stranger wounds it, it recovers its human appearance.
According to other versions, on Friday at midnight the lobizón (still in human form) flees in search of an animal that is lying down and makes it rise so as to roll in its warmth; in this way it manages to transform itself, an effect that will last until dawn.
The lobizón is a fierce being with a violent gaze. Firearms have no effect on it; only bladed weapons can harm it. When it sees its own blood flow, it returns to human form and becomes the enemy of whoever has revealed its secret. The lobizón will pursue its enemies to the death, regardless of whatever blood tie binds it to that person.
In other accounts, the lobizón man is a sleepwalker who rises while still asleep (still in human form) and seeks out any animal he can find. When he finds one, he circles it seven times until he transforms into a beast, then escapes into the wilderness to seek out his victims.
In Brazilian traditions, the lobizón is known as the lobisome. Several versions of this belief also exist: it may be a fantastic being in the shape of a puppy that emerges from the cemetery at midnight shooting fire from all four paws; or the seventh son of a married couple who bites everything he encounters and would be freed from his condition as a lobisome if someone were to wound him; or, finally, a man who, having had impure relations with his comadre, transforms into a dog or a pig on Friday nights and bites people.