In the French dub, Jean Reno voices Shadow and Christain Clavier voices Chance.
Throw It In: Chance running full throttle into a sapling and then keeping on running (specifically the part where Chance implies that Sassy is fat when rushing off for breakfast) was done completely by accident by the dog actor. They thought it was somewhat hilarious, so they kept it in. Similarly, Michael J. Fox and Sally Field adlibbed the lines right after Chance ran into the tree.
Similarly, Chance stumbling when running through a field was given a humorous line. "Whoa! Gopher hole!"