Severe abdominal penetrating injuries can occur from car accidents, falls, gunshot wounds, running into a stick, fights with other animals, foreign body entrapment or impalement. A dog in pain may bite, hunch it's back and/or refuse to move. With a wound that penetrates all of the way through the abdominal wall, you will notice bleeding and possibly an opening into the abdomen and exposure of organs. In severe cases, abdominal organs will protrude through the wound. This is a medical emergency, seek veterinary help as soon as possible.