Wikia

Prowl
Prowl 10 sec cooldown Instant Puts your pet in stealth mode, but slows its movement speed by 50%. The first attack from stealth receives a 20% bonus to damage. Lasts until cancelled.
Usable by
Class	Hunter
Pet	Cat
Properties
Type	Utility
School	Physical
Cooldown	10 sec
Related buff
Stealth Prowl Stealthed. Movement speed slowed by 50%.

Prowl is a hunter pet ability unique to cats.

Notes

This ability is initially set to auto-cast, confusing and frustrating some new hunters. An easy way to remedy this situation is to right-click the ability (turning off auto-cast) and then send the cat in to attack a mob. Upon entering combat, prowl will drop and will not reactivate until left-clicked.

Patch 3.0.8 (2009-01-20): Prowl (Rank 2) level requirement lowered from 40 to 30.
Patch 1.7.0 (13-Sep-2005): Added.