The Dog Bone schematic is a very powerful tool in the Zombies mode for Call of Duty: Modern Warfare 3, as it instantly summons a Tier 3 Hellhound to do your bidding. This Classified schematic can be very difficult to get, and ties in with the Dark Aether Rift.
How to Obtain Dog Bone Schematic in MW3 Zombies
Modern Warfare 3 Zombies can get the Dog Bone Schematic by entering the Dark Aether Rift and completing one of the three Contracts available. The Dark Aether Rift was introduced into Zombies with Season 1, and is located at the giant black tornado south of the red High Threat zone.