Dogs sometimes eat things that are not food. Pica is defined as the persistent chewing and consumption of non-nutritional substances that provide no physical benefit to the animal. It can be a sign of distress or anxiety. There are many potential causes of this anxiety including changes in the social or physical environment or because of an internal oddness in how the animal perceives or interacts with the world. Eating objects, such as rocks, can also be very dangerous for your dog, as these can be stuck in the stomach or intestine. Sharp objects, such as sticks, can cause damage to the delicate lining of the intestinal tract. It is therefore important that you know more about this behaviour to understand how to manage it appropriately.