1. Fracture or fracture: Dogs may have fractures or fractures, which are manifested as pain, limping, swelling and other symptoms.
2. Trauma: Dogs may have skin abrasions, congestion, hematoma and other traumatic symptoms.
3. Internal injuries: Dogs may have visceral injuries, such as spleen rupture and lung contusion, which are characterized by dyspnea and abdominal swelling.
4. Head injury: Dogs may have head injuries, such as skull fracture and concussion, which are manifested as coma, vomiting, loss of balance and other symptoms.
5. Nervous system problems: Dogs may have nervous system problems, such as spinal cord injury and nerve injury, which are characterized by quadriplegia and uncontrollable urination.