Gameness is the ability to maintain the attack . . . despite ripped flesh, dehydration, exhaustion or broken bones.
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The dog may crawl, stagger, or drag himself toward the other dog as long as he doesn't stop or hesitate. . . .
In one well-known case, the owner of a dog demonstrated how courageous his dog was by cutting off each of her legs, one leg at a time, while she continued to drag herself to attack. . . . The dog was lost, but her offspring were in high demand.
-- Pit Bulls for Dummies, D. Caroline Coile, Ph.D.