I decided to test the ability of a SureFire light to stop a trained attack dog. We set up an experienced decoy in a dark warehouse and sent the dog on a bite command. At the last minute, the decoy switched on the light and kept it in the eyes of the dog. It stopped the dog in its tracks. The dog tried to get around the light, but the decoy was able to keep the beam centered in the dog's eyes, stopping these efforts. We did this with multiple breeds and used both the E2D LED Defender and the 6P Defender [superseded by the 6PX Defender--Ed.] lights with equal success. I always thought a SureFire would stop an untrained dog, but never a fully trained protection dog. I was wrong.
See the E2DL and 6PX Defender flashlights: