person wearing appropriate protective clothing holding a leash or lead with a working dog, usually wearing a harness may be wearing a hat or visor might be carrying a whistle or clicker may be carrying treats or toys
handler which has person wearing appropriate protective clothing handler which has holding a leash or lead handler which has with a working dog, usually wearing a harness handler which may be wearing a hat or visor handler which has might be carrying a whistle or clicker handler which may be carrying treats or toys