Bob Thomas drew them for the back cover of Bear's Choice — the live album Owsley "Bear" Stanley selected and compiled from his own tapes. The bears are a pun on his name. Stanley said the figure started from a lead type-slug of a generic bear, a stock piece out of a printer's font.
He also pointed out, more than once, that they aren't dancing. They're marching. Sixty years on, nobody has taken the note.
Officially licensed Dancing Bears gear from the Grateful Dead x Relix collection: tees, long sleeves, crewnecks, hoodies and caps, from the magazine that has covered this band since 1974.
Shop by piece: T-Shirts, Hats, Long Sleeve T-Shirts.
Thomas also drew the skull — see the Stealie collection. If you're after the other creatures in the Dead's bestiary, try the dancing skeletons. The full run is in Grateful Dead x Relix.