a mongrel dog wandered in and out , sniffing , and flies buzzed everywhere , mosquitoes too , while daniel desouza checked sheldon 's work for himself out of idle curiosity or sheer insanity , joe could n't tell anymore , numb to it by this point , standing there waiting to meet his maker as desouza poked a screwdriver into the bomb and his wife came back in and swatted at the dog .