Puppies do common biting, play biting, mouthing, and nipping behaviour since they check out their setting and figure out how to communicate with other pet dogs and other people. Separation anxiousness is a standard https://www.google.com/maps/d/u/0/edit?mid=1Loaxd9o4I0MvP5CHmLZ6bvGvzslqEQw&usp=sharing