It's a Wonderful Half Life / Shepherd Dog

S2 E11: Fed up with each other, Cat and Dog dream that they are separate creatures, never having met. Dog dreams that he is a hobo, hopping trains and eating as much garbage as he wants. Cat dreams that he lives in a huge mansion, being waited upon hand and foot by Winslow. Cat and Dog meet when Dog saves Cat from a pummeling by the Greasers. The two dream clouds merge, and Cat and Dog both realize that they are better off with each other.A truckload of sheep crashes near the CatDog house, and Dog artfully herds the flock back into formation. The shepherd, Maggie MacDougal, hires Dog to be her sheep dog. Dog finds his life's work, choreographing elaborate formations, while Cat grows weary of the job. Dressed as a ewe, Cat infiltrates the flock in order to incite a revolution against Dog. But Cat gets trapped in Maggie's truck as the flock is being driven to slaughter. Dog rescues Cat and the rest of the sheep, taking the flock home with him.