Another day another monster, I'm thinking I'm going to try to schedule these as a monster a day thing, maybe, we'll see how long I can keep it up for, but I have a fairly large backlog already. Early editions of D&D really don't expect the party to go into a dungeon unsupported: mounts, hirelings, allies, pack mules, and other various hangers on keep a party from dieing too quickly. The war dog is supposed to serve as a sort of auxiliary to the party, taking down lightly armoured foes and chasing down those who flee. They can also serve as mounts for small characters.
I also consider this creature a way for the party to get a measure of revenge on certain enemies, if golbins have wolf riders should you get a chance to release wolfhounds on them.
Neutral Medium Beast
Str: 15 (+2) Dex: 15 (+2) Con: 15 (+2)
Int: 3 (-4) Wis: 12 (+1) Cha: 6 (-2)
Speed: 40 feet
Melee Attack: bite +2 melee (1d8+2 piercing)
Special Traits: Low-light vision, scent
Notes: As a DM I would peg the cost of buying one of these beauties relatively low but limit the total number for sale. Say 25 gp each but not allow a party to get more than one per party member, even if one member handles them all, also I would not allow a party to directly control them in battle, instead allow them to make handle animal checks to give general instruction and run them yourself. You might want to consider looking at the 3.5 tricks rules for animal training for suggestions.