"Hey Bulldog" is a song that appears in Yellow Submarine. It was written by John Lennon but was credited as Lennon/McCartney. It was recorded on February 11, 1968 and released January 17,1969 in the UK and January 13 in the US. It was written specifically for the film.
Though the song was intially called "Hey Bullfrog", Paul barked for no reason midway through the song, resulting in the lines "Hey bullfrog" to become "Hey bulldog", along with the title.
Geoff Emerick, the Beatle's engineer, would later claim that this was their last song that they approached with a team dynamic.
During the recording sessions, a film crew photographed them at work for a promotional video for their four-month retreat to India. It was later edited together as a promotional film for "Lady Madonna."
In the original US version, the sequence with "Hey Bulldog" was missing because producer Al Brodax believed it was too long. When the movie was re-released in 1999, the lost scene was included.