Self-injurious behavior in dogs is an abnormal behavior that may have a variety of possible causes, including the following: Pain or itching: Dogs may experience pain or itching resulting in bites or scratches own skin or hair. Anxiety or Stress: Dogs may bite or scratch their skin or hair when they are overly stressed or anxious. Behavioral issues: Dogs may sometimes have behavioral issues, such as excessive pushing or biting, which can lead to self-harm.
Medical problems: Dogs may have some kind of medical problem, such as drug reaction, external parasite infection, muscle or nervous system problems, etc. This leads to self-harm. If your dog is self-mutilating, it is recommended that you take it to the veterinarian immediately for examination to find out the cause and provide correct treatment.