Dog
In the Fallout world, dogs are little different from the ones found in our world, though many have become feral and vicious in order to survive in the harsh environment of the Wasteland. Even so, just as they have in ages past, many dogs have remained faithful and beloved companions to men and women. Probably the most famous of these post-nuclear canines was Dogmeat, the companion of the Vault Dweller.
You can recruit a few different types of dogs as companions. One source is the dog trainer residing in The Salvagers area of The Boneyard. The characteristics of these dogs is different from the data listed on this page. See Mercs page for more information about the dogs you can purchase.
Note: You cannot tame dogs the way you can a Brahmin.