Its happened again this morning. My dogs spring loaded clip had come undone from its collar. Its impossible for this to happen. The clip is spring loaded and needs to be held open and unhooked. Its not possible to happen, but it keeps happening. Thank goodness I have a mesh door thats closed just in case this happens. Next doors new chickens have not escaped its eye recently. At first I thought someone was unleashing it on purpose, but as the door is still closed that makes no sense.