Wolf

Wolves are creatures found in the Core Region in Fallout 2, Fallout Tactics and Van Buren

Characteristics
Wolves have sharp teeth and will frequently knock a target over, then attack the head.

Gameplay attributes
Wolves almost always travel in packs. Though they are less numerous than the horrible mongrels in Dogtown, wolves are much more individually dangerous and persistent.

Van Buren
One of them lives in the Nursery Repository, and can be acquired as a follower.

Physical attributes
Unlike other Wasteland creatures wolves seem to have been barely (if at all) affected by radiation which makes them one of the few "unmutated" animals still living in the wastes.