Cerberus Into The Darkness

When Lance Corbin, A marine serving in the war against Iraq, finds a dog in the woods with mysterious glowing bite marks on his neck, his whole life changes.
When Lance restores the dog back to health in secret, over time the dog shows his supernatural ability to turn into a three-headed-monstrous-hound with powers unimaginable.
After his time in the service is up and he is honorably discharged, he takes the dog home with him to his wife Scarlet and together they name him Hades.
Overtime, Hades sets them on an adventure, making them see things they never thought were possible or existed.
As Scarlet and Lance fight through the Zombie Apocalypse, trying to survive, they are sent into a word of the supernatural as well as Azazel the fallen Angel waits for the right moment to strike and summons Lucifer out of his prison to unleash great evil upon the world, causing Armageddon and forcing them and several other to stop him before it is too late as Gods presumed dead.