WoWDB

This pet can be difficult to get. Just in case you're hunting for it and you see none arround, start killing the Enraged Fire Spirits in the area - this seems to speed up the respawn rate for the little guys as well.

One of the pets which use the high damaging Immolate/Conflagrate Combo.

Another option would be to use Scorched Earth, leaving a dot on every enemy as long as the weather effect is up.