 Harnesses, collars and other equipment can also pose a serious risk to the dog while working if they were to become snagged on steel rebar or other items contained within a disaster site.Because the dogs often work out of sight and out of reach of the handler, it is critical to minimize the possibility of the dog becoming trapped in a confined space or choking from an entangled collar.Because of the distinct possibility of injury from broken glass and metal, the medical unit maintains supplies for the canine rescuers.