Coyote

Coyotes almost always travel in packs like their wolf cousins. They have sharp teeth and will frequently knock a target over, then attack the head.

They are a bit stronger than the dog but weaker than the wolf.

Wild Mutant Coyotes
Wild Mutant Coyotes are dog seen in Carbon,Texas.

Imagine a large, wolf sized Coyote trying to bite your face off. Now imagine a pack of them. Sounds like fun? Then you'll love these scavengers! They hunt in groups, and they're always looking for a little meal to tide them over until nighttime. You just happen to be the next thing on the menu...

Fallout: New Vegas
Coyotes return in New Vegas. They are hostile animals.

Appearances
The coyotes appear in Fallout and Fallout: New Vegas. They were also going to appear in the canceled Fallout: Brotherhood of Steel 2.