This may be old news to some, but here's something I stumbled on yesterday.
Random level 1
Flayer Youngling (high level)
(XXX beast or elemental Hatchling with Sticky Web and Leech Life - high level)
Really, the Flayer Youngling is enough on its own, or the Hatchling can probably work alone too, but will take a little longer.
Take this team to the end of the peninsula just east of Stoneplow in Valley of Four Winds. There are a ton of critter groups there. As long as the level 1 can survive the first hit (and often the critters will do a non-damage attack) and land a small hit, you're good to go. The Flayer Youngling can tear through the critters, yes all three, and barely takes any damage. If you need to swap in the Hatchling as backup, that works just as well, just not as quickly as the Flayer.
With this basic setup, you can level a pet to 10 (and higher) very quickly. The pets respawn quickly in this area and you barely have to move. There are hardly any mobs to avoid. You really don't even need to use pet bandages, since the two high level pets will not need much healing and the low level pet will get healed as it levels.
Note: you'll get an aquatic enemy every so often, too. These don't go down quite as easily as critters, but still don't present much of a problem.
Anyone else have any other similar situations they've found?