A BOY, A BALL, AND A DOG

"An adventure story about a boy and his dog running through the neighborhood and playing catch"--

There was never a ball the boy wouldn't throw.
Luckily, there was never a ball that his dog couldn't catch.

When a new kind of ball (a balloon) floats into the picture, both boy and dog try to find a way to play with it, and they become separated. Will they find their way back to each other and finish their game?