Make a "class change quest" for the wolf. You can choose from the following classes...
1) Working Breed - can carry lots of stackables for you (SS/Arrows/seeds) - spends his SP on increasing his carrying capacity and inventory slots.
2) Sporting breed - Damage Dealer - spends his SP raising the power of his skill "Rabies" which is a DOT and acts like poison.
3) Hound - Can find things not normally there - spends SP raising the power of his skill "root", which is similar to Spoil/sweep, however when a wolf roots around, he only finds pet food, and pieces/recipes to make pet weapons / armor / soulshots.
Toy - while summoned, increases parties HP/MP regen while not in combat. Spend SP increasing regen rate.
Once a wolf completes the class change, it shall forever be of that type of wolf. I would suggest this class change quest can happen after the wolf is lvl 50.