Pet Battle: [1-2] Mulgore; [1-3] Silvermoon City; [1-3] The Exodar; [3-4] Westfall; [5-7] Duskwood; [6-7] Wetlands; [12-13] Dustwallow Marsh; [20-21] Netherstorm; [22-23] Crystalsong Forest
Grooms face, sniffs air, and wanders around.
100% Hit Chance
Scratches the enemy, dealing 394 Critter damage.
100% Hit Chance
Deals 295 Critter damage.
Deals 197 additional damage if the user has lower health than the target.
Rapidly strikes at the enemy 1-2 times, dealing 197 Critter damage per hit.
Hits an additional time if the user attacks first.
Instantly deals 197 Beast damage and Poisons the target for 98 additional Elemental damage per round for 5 rounds.
Starts a stampede, causing 177 Critter damage.
Opponents struck by the stampede take double damage for 2 rounds.
Stampede continues for 3 rounds.
You endure, preventing your health from being reduced below 1 health until the end of the next round.
Pets affected by Survival will survive an Apocalypse.
Critters are immune to stun, root, and sleep effects.
50% from Beast abilities
33% from Elemental abilities
I just want to point out, the mouse can be find as a primary pet in Westfall - since location tab for Westfall says it can only be found as a secondary pet.
Got a "blue" Level 19 one in Netherstorm - changes colour - summoned a few times and got the white and brown skin.
I found both the white mouse and the brown mouse in Westfall.
Although not listed as a location when you read the pet itself, Crystalsong Forest right below Dalaran is great for Mouse as primaries. Around the ruins, particularly. They are usually white skinned (I think because of the flavor of the zone) as primaries, but do sometimes come in brown as primaries as well. Regardless, Crystalsong Forest is a good location due to the very low number of pet TYPES there, and the fact that this will give you a higher level pet.
The location tab says that in the Wetlands this is only found as an added pet to a pet battle. However, I found one as a primary pet, location (40.5,26.5).
There are very very many of these running around The Exodar. Specially congragating at the tops of stairs/ramps between levels and in quiet empty areas in most of the "wings" off central gathering places.
Just found a lone, poor-quality Mouse just south of Camp Sungraze in Mulgore. No co-ords since I don't have a mod for them installed right now. Tried to kill it slowly with Onyxian Whelpling but I accidentally two-shot it. Either way, it's proof that they don't only spawn as companions.
Got one in mulgore, 52.0 28.8
These are not only "added pets" in Dustwallow Marsh, I happen to be standing right next to one at this very second. :P