It is because he didn't wanted live people coming to the underground world.
Cerberus, the three headed immortal dog.
Hades symbol was his three-headed guard dog Cerberus . He has also been seen holding a scepter.
To guard the entrance of Hades.
The three headed dog owned by Hades was named Cerberus.
The Keys to Hades, the two-headed dog Ceberus and the Helm of Darkness.
In the Underworld-hell- as the guard dog of the god Hades.
Cerberus, the three headed immortal dog.
Hades symbol was his three-headed guard dog Cerberus . He has also been seen holding a scepter.
Cerbeus is a symbol of Hades the god because he was Hades' faithful guard dog. Cerberus is the giant 3-headed dog that guards the entrance to the underworld, also known as Hades so is also symbolic of this as well.
Hades himself owns a beast; guard dog named Cerberus. And I am sure The Underworld contains many countless unusual beings.
Hercules (Heracles) captured the three headed guard dog of Hades, god of the underworld.
he is hades Guard dog. the one with the crazy eyes and bites you when ever you jump, yeah the one. he also has three heads.
The three "witches" who helped hades in the underworld were the fates. Cerberus guards Hades.
To guard the entrance of Hades.
cybrus
The three headed dog owned by Hades was named Cerberus.
THEY LOOK LIKE HADES in hercules