Bone

The Angry Kid is out on his bicycle, taking one hand off the handlebars, then the other, then both. He takes a bad fall, and when he picks himself up, one of his arm bones is sticking bare through his shirt at the elbow. A stray dog comes leaping into the frame and makes a grab for the bone. A dogfight ensues and the Kid may need to tap into his own animal instincts to save his arm.