Food guarding is a defensive act that a dog displays to convince others to stay away from something that is considered valuable to them, such as food.
When a canine is food guarding, they can bark, howl, chase, and even go to full-blown aggressive actions such as biting.
Food guarding can be caused by several reasons, from genetics to past experiences and even to learned behaviors.
In many cases, food guarding behavior is nothing to worry about. Simple steps such as letting your dog eat alone in a separate room or in a crate will do the trick. In severe cases, however, you should seek professional help and talk to your vet, for the safety of your pooch and others around.