Dogmeat (Fallout)

Dogmeat is a dog that could be found in Junktown, a parody of the dog Mad Max has in the film Road Warrior. He could be found terrorizing an old man in Junktown by 'guarding' the doorway to his house and keeping him out; the protagonist could distract him for the old man by acquiring his companionship. This could be achieved by feeding him iguana-on-a-stick (or possibly the human-variant...) or wearing a black leather jacket, which would remind him of his previous owner - i.e. Mad Max - who also had a such jacket, leading the dog to believe it was he who returned. (Unfortunately he hasn't, since he had been killed by Gizmo about a month ago)

Dogmeat appears in Fallout and also as a part of an easter egg in Fallout 2 (he is found in the random encounter the Cafe of Broken Dreams). He was not going to appear in Van Buren.