Is it against the law to save a horse with broken leg?

No, it is not against the law to save a horse with a broken leg. In fact, it is generally considered to be the right thing to do. If you see a horse with a broken leg, the first thing you should do is call a veterinarian. If you are unable to reach a veterinarian, there are some things you can do to help the horse until the veterinarian arrives. First, try to immobilize the horse's leg. This can be done by using a splint or by simply using your hands to hold the leg in place. Next, try to clean the wound and apply a bandage. If the horse is in pain, you can give it a mild pain reliever such as aspirin or ibuprofen. It is important to note that you should never give a horse more than one dose of pain reliever without talking to a veterinarian first.