Acute neuritis in dogs, the full name of canine acute infectious polyneuritis, is a neurological dysfunction disease caused by a variety of reasons that damages most peripheral nerve endings and causes symmetry in the distal limbs, including nerve endings and nerve fibers. , nerve roots, meninges, myelitis, and manifest clinical symptoms from mild to severe in sequence. The early stage of the disease is spasm and edema of the dorsal and lumbar muscles, abdominal muscles and femoral muscles. Later, it is manifested as muscle atrophy. When palpated, there will be pain, arching of the back, curling of the abdomen, moaning, delay, bladder retention, Symptoms include passing soft stools or black mucus, and the anus becoming purple.