The Chihuahua (well, all three, including the two you can sort of half see) are from the vicious Chihuahua gang. I have no idea who the boy is, but I have to admit, the whole tableau is quite adorable.
Pictures are from the grand opening of the Rincon Hill Dog Park, directly out in front of le truc.
There seem to be two breeds of Chihuahua out there, really: the 'terrified' breed and the 'EXCITED!' breed. This guy is definitely the latter.
Yep, that's a cute kid all right.