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 dogs but weaker than wolves.

Fallout: New Vegas
Coyotes can be found in the Mojave Wasteland, primarily around Goodsprings at lower levels. They will growl at the player if he/she approach them, but will not attack if the player backs away, even though they show up as hostile on the radar.

Drops

 * Coyote meat
 * Coyote hide

Wild Mutant Coyotes
Wild Mutant Coyotes are coyote were also to appear in Fallout: Brotherhood of Steel 2.

''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...''

This Creature is probably not canon because it contradicts the statement in Fallout 3 which says that dogs were strangely unaltered by radiation.

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