Magical crawdad
Extremely durable, if you run it with renewing mists and wish you'll find that there are very few pets who can take it out without flying moves.

I don't think Blizzard has ever made humanoid children killable..? We may have kidnapped a few wolvar pups here and there, or dragged orphans with us on to the battlefield, but I don't remember any quests to slaughter children. They're generally immune to attack. We're more apt to have quests savin...

http://www.warcraftpets.com/wow-pet-battles/create/9dj/

simple concept