1. Spinal cord injury: such as spinal cord compression and myelitis. As a result, spinal nerve conduction is blocked and dogs cannot coordinate their movements normally.
2. Neuromuscular diseases: such as cervical disc herniation and muscular dystrophy. , will affect the normal function of nerves and muscles.
3. Brain diseases: such as intracranial tumors and encephalitis. There is a problem in the connection between the brain nerve and the muscle, which leads to muscle stiffness.
4. Genetic factors: Some dog breeds have genetic diseases, such as Afghan hound disease, which will cause dog stiffness.
5. Poisoning by drugs or poisons: Some drugs or poisons will interfere with nerve conduction or affect muscle function, causing dog stiffness.