Merrie Melodies - All a Bir-r-r-d (1950)

All a Bir-r-r-d is a 1950 Warner Bros. Merrie Melodies cartoon directed by Friz Freleng. It was written by Tedd Pierce and directed by Isadore "Friz" Freleng. The short was released on June 24, 1950, and stars Sylvester, Tweety and an unnamed bulldog, who would later become known as Hector the Bulldog.
The title is an adaptation of the familiar train conductor's call, "All aboard!" The instrumental theme used to underscore the motion of the train is "On the 5:15".