Seinfeld Season 3 Episode 4 : The Dog
Jerry is watching an unruly dog, for a fellow airline passenger who's sick in a hospital somewhere in Chicago. Jerry, can't leave his apartment, that leaves George and Elaine alone together. They find they have little to say to each other without their conversational third, Jerry; so they talk about him. Kramer tries breaking up with his girlfriend. Jerry can't locate the dogs owner, who was released from the hospital, some time ago.