What was the three-headed dog's name?

What was the three-headed dog's name? - briefly

The three-headed dog's name is Cerberus.

What was the three-headed dog's name? - in detail

In Greek mythology, Cerberus, also known as Kerberos, is the infamous three-headed dog that guards the gates of Hades, the underworld. This formidable creature is tasked with preventing the souls of the dead from escaping and ensuring that no living person enters the realm of the dead without permission. Cerberus' name originates from the Greek word "kerberos," which means "spotted" or "dappled," reflecting the dog's distinctive appearance. According to ancient accounts, Cerberus was born from the monstrous Typhon and Echidna, making him a sibling to other fearsome creatures such as the Hydra and the Chimera. His three heads are often described as barking in different tones, adding to his intimidating presence. The name Cerberus has become synonymous with loyalty and protection, as seen in various cultural references throughout history.