Though hunters can respec their pet gorillas into Cunning or Ferocity, they are inherently Tenacity. In addition to the abilities that come standard with all pets ([Cower], [Growl], [Avoidance]) and those given to their natural or retrained specialization, all gorillas are given the following:
Patch 3.1.0 (14-Apr-2009): Bonuses equalized. Damage had no bonus and now has +5% bonus. Health had a 10% bonus and now has a +5% bonus.
Patch 3.1.0 (14-Apr-2009): Now have a new family ability, Pummel, which works like the warrior ability and has a single rank. Pummel replaced Thunderstomp, which is now a talented ability.
/Patch 3.0.2 (14-Oct-2008): Major changes. Bite replaced with Smack. Gorillas can now eat bread. Armor had no bonus and now has a +5% bonus. Health had a +4% bonus and now has +10% bonus. Damage had a +2% bonus and now has none.