A tool and method of using are disclosed for field dressing big game. The tool has a tip sized for insertion into the anus of the animal and a set of barbs extending a radial distance beyond the tip. The tip and the barbs are mounted to a shank and handle. Inserting the tip and barbs into the rectum causes radial stretching of the rectal wall, and rotation of the tool causes ensnarement of the rectum on the barbs. The tool is retracted from the anus, pulling a section of rectum external, to be closed for the prevention of leakage of bodily waste matter.