Cops in Los Angeles are investigating the attack which vets say left the animal with severe wounds to its head, neck and torso.
"It's almost like they tried to cut his head off, it's ear to ear," said Alex Kyrklund, a manager at the Pet Care Veterinary Center where the dog was treated. "He seriously almost looks like an autopsy victim."
However, the Ghetto Rescue Foundation said Spartacus is up and walking and expected to make a complete recovery.
They added that the dog will eventually be returned to its family.