The entire process of the growth and fall of a dogs teeth is similar to that of the human babies. When puppies are born, they dont have any teeth, and when they hit three weeks old, the teeth start coming in. This is also the time when we can offer our canine babies solid food. At around four months past, the baby teeth start falling off. This can be a little problematic as teething pain can make your dog fidgety. Read on to know more about your dogs teeth.