The wounded dog is a random encounter where one can approach a wounded passive female mongrel (Sole Survivor refers to her as "Bitch"). Her right legs are at 0 health when checking V.A.T.S.
Interactions with the player character
Interactions overview
Interactions
This character is essential. Essential characters cannot be killed.
This character is a permanent companion. They grant the - perk.
The Sole Survivor can interact with the mongrel and will be given the dialog prompts to ask if there is anything wrong and then a second prompt to render help in the form of a stimpak will be available. Afterwards the right legs will be at full health in V.A.T.S. and the mongrel will walk normally. The third dialogue prompt has either asking her name or choose between the three names Mutt, Sparky or Buttface. If having to ask her name instead of picking one she will then be labeled "Mutt" afterwards. After the naming dialogue concludes Mutt will simply stay in the area until the encounter/zone resets.
She will appear pleased that you have saved her, sometimes producing a teddy bear and happily tossing it about.
Mutt will follow the Sole Survivor around within a relatively large area if they don't walk too far away. The encounter at the Starlight under the Railroad bridge will have Mutt follow as far as the restaurant overhang at Starlight. She cannot be assigned or interacted with in build mode like one would a purchased junkyard dog. Mutt will not interact with a dog house if placed. Pickpocketing a dog collar into Mutt's inventory won't have any effect. Very rarely, Mutt may turn up in random locations after the first encounter if she was aided.