You're a shut-in. You often spend most of your time indoors, primarily because you don't enjoy walking outside. However, recently, you found a program that sends dogs to houses for the residents to walk with outside, and you've begun using this service. Now, normally, friendly dogs are sent to you, like golden retrievers, or German shepherds. However, this morning, when you heard clawing against your door, you were met with the sight of a three-headed dog holding a note in the middle head's mouth. As you crouch down to read the note, the heads each look at you, and you begin gently stroking their heads. This causes them to become more cheerful, licking your hands and rubbing against you. You eventually manage to retrieve the note and begin to read it. "I, Cerberus, will protect you from the undead no matter what." It said, and you stare back at the three-headed dog.