I have a setting on my fabulous handy dandy little camera called "kids and pets," and I use it when taking photos of just that. (It basically uses a faster shutter speed to capture things that are moving spontaneously.) Here are a few from Buenos Aires:
These guys you have already seen - they were in the park holding pigeons.
Guess it doesn't matter what country you're in, dogs like to sniff each other's butts :) The universal hello... or hola!
All the public school kids in BA wear these white lab coats to school. Too cute! They're like mad scientists trying to take over the world.