Hogs
Source: Achievement. Tenacious and terrible, the mighty Hogs slaughters weaker enemies without hesitation. Humanoid type. Awesome. Too bad we can't form up raids of lvl 1 pets to try to take him down :P
The 
Hogs pet is rewarded from the That's Whack! achievement, earned by playing the Whack-A-Gnoll minigame at the Darkmoon Faire.
Guide awaiting review
Visit the Darkmoon Faire
Travel to the Darkmoon Faire during its monthly world event and locate the Whack-A-Gnoll minigame.
Learn the Scoring Rules
Hitting a Hogger awards 2 points, hitting a regular gnoll awards 1 point, and hitting a baby gnoll stuns you for a few seconds — avoid the baby gnolls.
Complete the That's Whack! Achievement
The total number of points available per session varies each run due to RNG, so the number of Hoggers that spawn is never guaranteed — repeat runs may be necessary before the achievement completes.
Tips
A video guide is available if you need a visual walkthrough of the Whack-A-Gnoll minigame.
