When it was just my shih tzu she used to bark at night and chase the squirrels and possums away, then along came maltipoo. He took over the job and my old shih tzu just continued sleeping. Now I have noticed that its my 4 month old gsd pup that runs outside and barks at the squirrels and the other two dogs stay in their bed. The gsd has a really deep loud bark and im sure he is waking up the neighbors. Is this a ritual of dog packs? the last one in has to take the night watch lol? I was just wondering if anyone had any ideas why this happens.