Davenport hit Chicago in 1945 at age 14. He quickly soaked up the sights and sounds so prevalent on the local blues scene, checking out Arthur Big Boy Spires, Snooky Pryor, and Homesick James, who invited the youngster to jam sessions and tutored him on the intricacies of the idiom. Gigs with Spires and James preceded his brief hookup with Bo Diddley (which included a booking behind Diddley at New York's famous Apollo Theater). Davenport led his own band while holding down a day job as a paint sprayer during the 1960s, remaining active on the West side prior to joining forces with the Kinseys during the 1980s.
Now, about that "Mad Dog" handle: it seems that Davenport liked to prowl the stage while playing a few notes on every instrument on the bandstand during his younger days. The shtick earned him the name; his tenacious playing did the rest. ~ Bill Dahl, Rovi