Wikia

Bite
Bite Meleerange 3 sec cooldown 25 Focus Instant Bite the enemy, causing X damage. Deals 100% more damage and costs 100% more Focus when your pet has 50 or more Focus.
Usable by
Class	Hunter
Pet	Basilisk, Bat, Beetle, Boar, Carrion bird, Chimera, Core hound, Crocolisk, Devilsaur, Dog, Dragonhawk, Fox, Hyena, Nether ray, Quilen, Ravager, Serpent, Shale spider, Spider, Turtle, Warp stalker, Water strider, Wind serpent, Wolf, Worm
Properties
Type	Offensive
School	Physical
Cooldown	3 sec (GCD 1.5 sec)

Bite is one of the pet abilities that most hunter pets can use, the alternatives being [Claw] or [Smack]. It scales with attack power.

Patch changes

/ Patch 3.0.2 (14-Oct-2008): Bite now has no cooldown, does the same damage and costs the same Focus as Claw, so works as a Focus dump. Every hunter pet can learn either Bite or Claw (never both).
Patch 1.2.0 (18-Dec-2004): Bite tooltip now lists the damage that is dealt when the pet is content. Actual damage is unchanged.