"One Small Step For Dog. One Giant Leap For Dogkind."
"The Buddies sneak aboard the experimental space shuttle Vision 1. The Buddies take a close look around until they are sealed into the shuttle, which is controlled remotely by Astro at mission control for its first flight."
(The above was taken from here and here... WARNING: Second link contains spoilers).
The movie was cute and sweet, and I'd watch it again!