Combat Training: An animal trained to bear a rider into combat knows the tricks attack, come, defend, down, guard, and heel.
Attack: The animal attacks apparent enemies. You may point to a particular creature that you wish the animal to attack, and it will comply if able. Normally, an animal will attack only humanoids, monstrous humanoids, giants, or other animals.
Come: The animal comes to you, even if it normally would not do so.
Defend: The animal defends you (or is ready to defend you if no threat is present), even without any command being given. Alternatively, you can command the animal to defend a specific other character.
Down: The animal breaks off from combat or otherwise backs down. An animal that doesn’t know this trick continues to fight until it must flee (due to injury, a fear effect, or the like) or its opponent is defeated.
Guard: The animal stays in place and prevents others from approaching.
Heel: The animal follows you closely, even to places where it normally wouldn’t go.
Other Tricks:
Attack [2]: ...Teaching an animal to attack all creatures (including such unnatural creatures as undead and aberrations) counts as two tricks.