There are several factors for hind leg pain as follows: First, the most common factor is orthopedic surgery, for example, when lumbar disc herniation, lumbar disc bulge, sciatica, sacroiliac arthritis, compression of the nerve roots of the lumbar region, resulting in pain in the area of the leg under the nerve roots that govern the lumbar region. Second, rear leg pain is also related to rheumatic diseases, rheumatoid diseases, such as rheumatoid arthritis, rheumatoid arthritis, will appear in the rear leg redness, swelling, pain and other joint dysfunction. Third, hind leg pain is also related to infectious factors, such as leg susceptible to bacteria, viruses, fungi and other pathogenic microbial infections, when the appearance of soft tissue swelling of both lower extremities, cellulitis or dermatitis will lead to pain, accompanied by increased skin temperature of the hind legs. Fourth, pain in the hind legs can also occur in patients with peripheral neuritis, such as diabetes combined with peripheral radiculitis, which can lead to painful symptoms in the hind legs.