There are three Pets tabs within the user interface. The first tab can be found in the character info window which provides players information about their currently active pet, such as their diet, attack power, etc. This tab has more useful information to hunters than warlocks.
The second pets tab can be found within the spellbook. This tab shows players what the currently active pet is capable of doing and what passive buffs they're receiving from their talents.
Since Mists of Pandaria, a third pets tab was added to the be under the Specialization & Talents interface, renamed from pet talents, allowing the hunter to change between the three types of pets, Tenacity, Ferocity, and Cunning.
- Prior to patch 4.1.0, the happiness level was previously shown in the character info tab.
- Patch 4.0.1 (2010-10-12): (Character Info window): The companions and mounts inner tabs were moved to the Spellbook. Removed happiness level.
- Patch 3.0.2 (2008-10-14): (Character Info window): Inner tabs for companions and mounts were added.
- These tabs were to replace items in your bags with castable spells.