How did Cerberus get the job of guarding the gates of hades?

Cerberus, the three-headed dog, was appointed as the guardian of the gates of Hades due to his fierce loyalty and intimidating presence. In mythology, he was the offspring of Echidna and Typhon, making him a formidable creature. His role was to prevent the dead from escaping and to ensure that the living could not enter the underworld without permission. This duty underscored the importance of maintaining the boundaries between the realms of the living and the dead.