The Border Armadillo (2009)

When Rango, a lost family pet, accidentally winds up in the gritty, gun-slinging town of Dirt, the less-than-courageous lizard suddenly finds he stands out. Welcomed as the last hope the town has been waiting for, new Sheriff Rango is forced to play his new role to the hilt.

Mickey and Pluto make a short stopover on a South American flight. Mickey throws Pluto's ball into the jungle, and he chases it but it looks exactly the same as an armadillo that's rolled up into a ball. This, of course, greatly confuses Pluto for a while. But he eventually makes friends with the armadillo. He chases the critter into a cave right behind his ball, and rips the ball apart thinking it's the armadillo, which makes him very sad until the armadillo shows up again.

An animated, faux nature "documentary" following the modern mating rituals of the female nine-banded armadillo.