Dogs have extremely keen hearing and a well-honed instinct for detecting danger. When the sky is alight with fiery explosions during 4th of July celebrations, that instinct is triggered in full force, telling your canine companion that it, and everyone dear to it, are going to die. This is why dogs panic and become unruly around fireworks. Dog trainer Peter Caine has some tips to keeping your dog calm and sane during the festivities.