Here is a brief overview of the taming system on WolvesbaneUO.
Repel - triggers on the next incoming hit. Your pet takes 50 damage and reflects 50 damage back at the attacker. This reflected 50 damage is then reduced by the resists of the target. If the target has 50% resist, the repel would do 25 damage
Venomous Bite - causes the creature to poison all nearby targets.
Fire Breath Attack - Is Dragons breath
Heal - Gives your pet the Ability to heal itself (Like the Cusidhe)
Colossal Rage - The creature goes into a rage, inflicting greater damage!
Howl Of Cacophony - lowers target's Swing Speed Increase by 60% and freezes them on the spot