American Black Bears (Ursus americanus) are the smallest and most widely distributed bear in North America. They are omnivorous. Black bears are highly dexterous, this means they are capable of opening screw top jars or door latches. When this does not get them what is inside, they will use brute strength. So no coop is impenetrable. They have good eyesight as well as a great sense of smell. They are far smarter than given credit for, once they learn where your critters are, they will return. Chained dogs are no threat as they learn to get around them and where they can reach. Not sure if that was black bear you saw? The color not quite right? Well they come in a wide range of color: white, blond, cinnamon, light to dark chocolate brown. The most common being jet black. They can on occasion have a white or off colored triangle on the chest. Below is a picture of bear tracks. Bear scat can be firm looking (like horse droppings) to what resembles a cow pile. Generally, it contains what they have been eating (chicken feed or feathers). And they come with a distinct smell of nasty wet dog with a hint of garbage.