Pets have varring levels on WP as high as level 30 in some cases. Your pets full potential can't be reached without training and leveling the pet up. As you level your pet will gain 'Ability Points' This short tutorial covers how (not the stradigy) to invest those points.
The NPC Info menu:
Left clicking your pet a menu will drop down. At the bottom you'll see an item listed as NPC Info. Click that
The Ability Points:
The NPC Info window shows basic information about your pet. For the sake of this discussion focus on the level information and ability points.
Spending Ability Points:
To spend ability points you need to click on the red dot at the bottom of the NPC Info Gump. This ill open the Gump below where you can choose to invest your points you and your pet have earned. Invest wisely as you can't change your points once invested. Avoid spending points on things your pet doesn't use such as putting lots of mana on a non-Magery pet. They will just go to waist.
Have fun! Invest wisely!
Kaw