After one year, three months and twelve days of isolation, the Vault 77 Dweller discovered a crate of puppets in the vault and began playing with them. The dog puppet was one of them. Later, the dweller assigned a personality to each of the puppets, naming the dog puppet Reverend Hound, the clergyman and sheriff of the vault. However, when the Vault Boy puppet killed The King puppet, the Vault Dweller, fearing that Reverend Hound would find out about his role in the crime, escaped the vault.
Reverend Hound appears only in One Man, and a Crate of Puppets.