Pesanta

In Catalan legend and popular culture, the Pesanta ([pəˈzantə], [peˈzanta]) is an enormous dog (or sometimes a cat) that goes into people's houses in the night and puts itself on their chests making it difficult for them to breathe and causing them the most horrible nightmares. The Pesanta is black and hairy, with steel paws, but with holes so it can't take anything.