All dogs are equipped with some level of possessiveness, whether it be of food, a toy, or their human. Any action that is perceived to take away the object of their desire can provoke a defensive reaction that could result in biting. Be extremely mindful when approaching any animal that is feeding or interacting with an object, and, when in doubt, let their human approach you rather than approaching them.
Everything we do sends a message to our pet. Did you know that giving your dog affection at the wrong time can send the wrong message and worsen unwanted behavior? Giving affection during desired behaviors is an important thing to remember.