What is the true origin of the title of Black Dog by Led Zeppelin friendly stray or satanic sacrifice?

The title "Black Dog" by Led Zeppelin is inspired by a black Labrador Retriever that wandered around the band's recording studio during the sessions for their fourth album. While some fans speculate about darker interpretations, such as a connection to satanic themes or sacrifices, the band members have clarified that the name simply refers to the dog. Thus, the title's origin is more playful and benign than sinister.