Compulsive scratching, licking, and chewing behaviors are quite common in dogs and have a variety of causes. They can also be harmful. One of the first signs your dog has a problem might be the development of a “hot spot” -- a red, wet, irritated area that arises from persistent chewing, licking, scratching or rubbing. Although hot spots, or "acute moist dermatitis," can occur anywhere on your dog’s body, they are most often found on the head, chest, or hips. Because dogs often incessantly scratch, lick, or bite at an area once it becomes irritated, hot spots can become large and incredibly sore rather quickly.