"Can it be as painful as the spur of a fighting cock in one's heel?"
The beginning of the cock fight. When the man in the center raises the cloth, the birds will see each other and begin to fight. Puerto Rico, 1937.
Public DomainThe beginning of the cock fight. When the man in the center raises the cloth, the birds will see each other and begin to fight. Puerto Rico, 1937.

From Wikipedia: "A cockfight is a blood sport between two roosters (cocks), held in a ring called a cockpit. Cockfighting is now illegal throughout all of the United States, Brazil and in most of Europe."

Ernest Hemingway and His World, a biography by Anthony Burgess, includes a photo of Hemingway and his gardener watching a cockfight. The caption quotes Hemingway: "Where else [other than Cuba] can you train cocks and fight them and bet those you believe in and be legal? Some people put the arm on fighting cocks as cruel. But what . . . else does a fighting cock like to do?" (page 94).

Spurs attached to the legs of a fighting cock
Creative Commons Attribution Share AlikeSpurs attached to the legs of a fighting cock - Credit: Superbass