Ralf, a military working dog with the Provost Marshal’s Office Kennel, bites a sleeve during aggression training aboard Marine Corps Air Station Miramar, Calif., Dec. 1. It takes about 160 pounds of pressure to fracture a strong bone and each day these handlers step into the ring with these dogs to be bitten over and over again with each bite ranging up to 265 to 328 pounds of force. - Ralf, a military working dog with the Provost Marshal’s Office Kennel, bites a sleeve during aggression training aboard Marine Corps Air Station Miramar, Calif., Dec. 1. It takes about 160 pounds of pressure to fracture a strong bone and each day these handlers step into the ring with these dogs to be bitten over and over again with each bite ranging up to 265 to 328 pounds of force.