Wikia

Cower
Cower 45 sec cooldown Instant Your pet cowers, reducing damage taken by 40% for 6 sec. While cowering, your pet's movement speed is reduced by 50%.
Usable by
Class	Hunter
Pet	All
Properties
Type	Defensive
School	Physical
Cooldown	45 sec
Related buff
Cower Reduces damage taken by 40%. Duration: 6 seconds

Cower is a damage-reduction pet ability shared by all hunter pets.

Patch changes

Patch 3.3.0 (08-Dec-2009): Redesigned. This ability no longer affects threat, and instead reduces damage taken by the pet by 40% for 6 seconds with a 45-second cooldown. While cowering, the pet's movement speed is 50% of normal speed. Cower now only has a single rank and is available at pet level 20.