Scavenger's dog

These dogs are found around Scavenger's encampments, and will be friendly to you, as long as you do nothing to the scavenger. Note that the nomadic scavenger's don't usually keep their dog companions nearby, and if a scavenger is killed by something other than the player, the dog will pursue their master's murderer, until the killer is dead, or the Dog itself dies. These dogs have a little less health and attack than Vicious Dogs, and are of the same breed as Dogmeat (Fallout 3), but are significantly weaker than Dogmeat.

There is a karma loss for killing the scavengers dog, as well as the Scavenger himself and the Scavenger's Brahmin if he has one.

may

it is also be known that scavenger dog will attack if the player continues to pursue the scavenger even after a warning is given... so be careful