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These come as seconds to twilight fiendling, i battled about 6 fiendlings and 4 of those fights contained the mouse as a second!
Found one in tanaris at 40,90 uncommon one, not seen anymore so far.
Spent 2 hours flying in a circle looking for one of these, i did clear the area completely of other pets, then one spawned, not sure if the clearing helps or not, was only an uncommon one but better than nothing, also did about 50 battles round there and none of them contained these as seconds.
Finally got a common one (after 4 nights of trying!) at 12am server time, very busy realm so there was a race on with lots of other players, i just wanted the kalimdor tamer achi so happy i got one, will wait to go back and see if i cant get a rare.
Good luck and dont give up :)