Conversation so far:
What does rip-off mean in relation to Hound Dog by Big Mama Thornton
Two records were released that were neither cover versions of nor answers to Thornton's release, yet used a similar melody without any attribution to Leiber and Stoller.
who ripped-off Hound Dog by Big Mama Thornton first
The first was Smiley Lewis's Play Girl, credited to D. Bartholomew
what label is Play Girl by Smiley Lewis, credited to D. Bartholomew, under
The first was Smiley Lewis's Play Girl, credited to D. Bartholomew and released by the Imperial Records label by the end of March 1953.

Question: Who did it second
Self-contained rewrite: Who ripped-off Hound Dog by Big Mama Thornton second after Smiley Lewis