Dog stiffness is a disease caused by muscle stiffness, also known as dog paralysis, which is mainly caused by abnormal nerve conduction. The specific reasons include the following possibilities:

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.