SRD:Dire Wolf

=DIRE WOLF=

Dire wolves are efficient pack hunters that will kill anything they can catch.

Dire wolves are mottled gray or black, about 9 feet long and weighing some 800 pounds.

Combat
Dire wolves prefer to attack in packs, surrounding and flanking a foe when they can.

Trip (Ex): A dire wolf that hits with a bite attack can attempt to trip its opponent (+11 check modifier) as a free action without making a touch attack or provoking an attack of opportunity. If the attempt fails, the opponent cannot react to trip the dire wolf.

Skills: A dire wolf has a +2 racial bonus on Hide, Listen, Move Silently, and Spot checks.

* It also has a +4 racial bonus on Survival checks when tracking by scent.

See Wikipedia Entry: Dire Wolf