A dog that grunts and scratches in an anxious manner may be caused by physical discomfort. Generally, pain, neurological diseases, and brain diseases can cause this condition in dogs. If your dog often does this, it is best to go to the hospital for examination. If the dog is not sick and uncomfortable, it may be because the dog misses its owner or wants to go out to play. This is especially true for large dogs whose energy cannot be released. At this time, the owner playing with the dog can effectively alleviate the problem.