Canserbero Porta Hay un Sentimiento muerto en un corazón Cancerbane is a mythical creature in Greek legends. It is commonly portrayed as a multi-headed dog watching over the gates of the underworld. In some myths, Cancerbero has three heads, while in others it can have up to nine separate heads. The word "cancerbero" is additionally used to refer to a vigilant and unyielding sentinel.