Tweet Dreams is a 1959 cartoon starring Sylvester and Tweety. It was directed by Friz Freleng. It is the only appearance of Sylvester Jr. and Tweety in the same cartoon, though the two never interact, and the footage of Junior is said to be a flashback of a young Sylvester.
At the Dog and Cat Clinic, psychiatrist Dr. Milt Towne sees Sylvester, who is having a nervous breakdown. He recounts a short scene from his boyhood where his father wouldn't teach him how to catch mice (actually a scene of Sylvester Junior from Too Hop To Handle). Then he tells of his troubles trying to fish and first meeting Tweety (in flashbacks from Sandy Claws).
Sylvester then tells the doctor about trying to catch Tweety at the circus (as seen in Tweety's Circus). Then about his embarrassment when he hid in Granny's knitting basket and his fur was knitted into a sweater (as seen in A Street Cat Named Sylvester). Finally, he relates the tale of Tweety shooting him in the face with a gun and Granny shooting him in the face with a plunger (scenes from Gift Wrapped).
Sylvester notices that the doctor is snoring. When he wakes up, the doc makes an excuse about having to fly to Detroit for an appointment, and he jumps out the window and starts flying. Sylvester flies out the window after him.