Canserbero Porta Hay un Sentimiento muerto en un corazón Cancerbero is a mythical beast in Greek mythology. It is commonly portrayed as a multi-headed dog protecting the gates of the. According to some legends, Cancerbero possesses three heads, while in others it can have as many as nine heads. The word "cancerbero" is also used to refer to a ferocious and unyielding sentinel.