Fetch is a hunter ability learned via the [Glyph of Fetch]. It allows the hunter to command his or her pet to fetch the loot off nearby corpses. This may be especially useful for mobs that die in areas the hunter cannot otherwise reach.
Patch 5.2.0 (5-Mar-2013): The Fetch ability from Glyph of Fetch no longer requires a target. When activated, the pet will automatically choose a nearby corpse to loot.