Actually it is about/for "Skydog".
Not to nitpick but.........................
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"Shortly after Duane's death, Ronnie Van Zant of Lynyrd Skynyrd dedicated the song "Free Bird", to the memory of Duane Allman. Many people assume the song was written about Duane, but this is not true; the song had been written before Duane had died. (Allen Collins wrote the song after his wife asked him the question "if I leave here tomorrow, would you still remember me?")
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Ronnie did, however "dedicate" the song to him after his death.