OP - Those mini pets look much meaner and frankly cooler than anything I've ever seen in wow.
If Blizz have included it as another feature to battle against their most probable future competitor, I can't see them coming up with designs that awesome. And those were GW1! o.0
And yes...you'd have to research animal husbandry and even further back to try to answer the silly "who started what" debate in this case lol.