Doppelganger / Save the Clams

S1, E25: Duke is sprayed by Skunky and taken to the vet for his treatment. While there, he brags to a Beagle about how great his life is on the barnyard. The beagle switches their charts, paints himself to look like Duke and goes to live at the barnyard. The animals have a blast with the new fun Duke until the real Duke arrives back at the barnyard, but will the animals choose the right one?