A senior prison official says Israeli jails are using a custom-built computer program to interpret the barks of guard dogs and distinguish between everyday woofs and warnings of a breakout. Noam Tavor, head of the Israel Prisons Service canine unit, says the program fixes shortcomings where guards have either not heard dogs sounding an alarm or failed to speedily identify its significance. "It collects the dogs' barks through microphones...and sorts and grades them," Tao told Army Radio Monday. "It relays only the barks that are significant in terms of security - barks that reveal stress or aggression in the dog." The radio said prison staff monitor the system through loudspeakers and TV cameras that automatically zoom in on suspected hot spots.