Dogs can feel anxious when they are separated from their owner, and this can lead to separation anxiety. Separation anxiety and stress are fairly common in dogs. When a dog is left alone, it may become very distressed, usually displaying a wide range of behaviors. A dog who displays anxiety may whine, bark, howl, pace, or chew. If left alone for too long, it may even attempt to escape. By implementing a few, but important training you can be able to prevent dog separation anxiety before it starts.