That little fellow on the right is Milo. I'm not sure who his friend is.
This is a great example of one of the many things I love about dogs: no matter what breed they are, and what size or shape, they all act about the same. Milo has no idea he's outsized by about 4 or 5 times his own body weight, and he doesn't care. To him, it's just two dogs playing some tug-of-war.
I'm not saying different breeds and different dogs don't have their own personalities, but they've all got basic dog behavior: they like tug-of-war, and like to pounce on tennis balls, and get curious when someone new comes into the house, and like getting scratched on the head. I love that despite their huge physical variations, they're still so obviously instances of the same abstract class when it comes to behavior.