Themes The title is a reference to a nameless black
Labrador Retriever the band used to see wandering the
Headley Grange studio grounds. The dog would disappear in the evening and return exhausted in the early morning, before resting all day and repeating his evening sojourns. Robert Plant believed the lab was spending nights with his "old lady" (dog). Likewise, the lyrics are narrated by a man obsessed with a woman, "got a flaming heart can't get my fill", he "can't keep away" from her "honey drip"; she reveals her true intention, spending his money, taking his car, "telling her friends she's gonna be a star", at which point the deception becomes clear and he turns cold, saying "a big-legged woman ain't got no soul". The story of lust, eroticism, and ultimately betrayal echoes the traditional reputation of the blues as being the music of the devil, alluded to in the lyric "eyes that shine a burning red".
Music The song opens with muted sounds of guitars warming up in the background, an idea by Jimmy Page, who also made curious opening sounds in "Immigrant Song" and "Friends"; he was fond of starting songs in an unexpected way. The sounds are actually recordings of various guitar track openings played simultaneously, creating a "sonic collage" in which the tape can be heard spinning up to speed. Robert Plant then begins singing in a high, strong voice, "hey, hey, mama" unaccompanied by music (
a cappella). This sets the structure of the song, around a
call and response dynamic, between the vocalist and the band, back and forth. Starting and stopping the music was Jimmy Page's idea, and he was inspired by
Fleetwood Mac's 1969 song "
Oh Well". Bassist
John Paul Jones, who is credited with writing the main riff, said he was inspired by
Muddy Waters' 1968 album
Electric Mud. However he retracted this, in 2007, saying that he was confused, and that his main inspiration was actually ''
The Howlin' Wolf Album'' by
Howlin' Wolf, particularly the repeating riff in "
Smokestack Lightning", which Jones and Page sped up. Jones added complex rhythm changes, that biographer Keith Shadwick describes as a "clever pattern that turns back on itself more than once, crossing between time signatures as it does." The group had a difficult time with the
turnaround, but drummer
John Bonham's solution was to play it straight through as if there was no turnaround. As Jean-Michel Guesdon notes, the recording contains rhythmic coordination errors, such as between 0:41 and 0:47, when the guitars are not in sync with the drums. He says it was part of the band's "genius" to discount these "errors" as "curiosities", i.e., characteristic signatures of the song. In live performances, Bonham eliminated the variation so that
Robert Plant could perform his
a cappella vocal interludes and then have the instruments return at the proper time. For his guitar parts,
Jimmy Page used a
Gibson Les Paul and made a complicated series of overdubs through various compressors and other equipment. This caused so much distortion, Page later said it sounded like an analog synthesizer. ==Recordings and releases==