Mist Howler is probably one of the nicest wolves a young hunter can pick up, due to his fast 1.3 attack speed (helpful against casters and for BM builds that plan to get the Frenzy skill), and his fast-as-any-cat pursuit speed (though that may be changing in 1.9 when all pet speeds look to be getting "normalized").
The black SFK worg is a slight bit faster at attack (1.2), but harder to get to solo, and some don't care for the animations on the worgs.
Mist Howler is a Rare spawn, so he might not be in the area on the map when you check the first time; I usually find him west of the path and near the shrine-looking structure there. He has a special attack that can break the taming process, so clear out the surrounding area a bit and be prepared to possibly have to try more than once. Mana potions are helpful in case you have to cast the Tame spell multiple times, and be sure to use the Freezing Trap skill you pick up at L20, as that will help a great deal.
The black SFK worg is a slight bit faster at attack (1.2), but harder to get to solo, and some don't care for the animations on the worgs.
Mist Howler is a Rare spawn, so he might not be in the area on the map when you check the first time; I usually find him west of the path and near the shrine-looking structure there. He has a special attack that can break the taming process, so clear out the surrounding area a bit and be prepared to possibly have to try more than once. Mana potions are helpful in case you have to cast the Tame spell multiple times, and be sure to use the Freezing Trap skill you pick up at L20, as that will help a great deal.