It is best to see what causes the following leg pain: joint Japanese encephalitis, foot-and-mouth disease, streptococcus, paratyphoid arthritis, swine erysipelas arthritis, rare rheumatoid arthritis, trauma or long-term friction with the ground. You can try this penicillin, two aminopyrine, and two potions that can quickly relieve pain, promote blood circulation and remove blood stasis. There is also a situation that only sows have, such as hypoxemia and beggar's disease. Glucose and calcium can also be injected.
The above hope can bring you help and good luck.