For those of you who have seen my guides thus far, hey! For those who haven't... you should go watch them :P
Anyway, I have created a quick guide on how to level pets to 25 quickly and easily (takes about and hour per pet) to complement the trainer series I have been working on. It covers the basic pricipals of power leveling a pet and two of the best locations to do it.
Note - The tactic presumes you have at least 1 pet at 25 already.