To help an animal with an injured leg, the key steps involve staying calm, assessing the injury without causing more pain or stress, and getting professional veterinary help promptly. First, observe the animal from a distance to identify if the leg is bearing weight or completely lifted, which can indicate the severity. Confine the animal to prevent further injury and avoid giving human medications, as they can be toxic. Prepare for safe transport by using a carrier for small animals or a blanket or sturdy board as a stretcher for larger ones. Handling should be gentle to avoid pain-induced biting, and a temporary muzzle can be used if needed to protect both the animal and the helper. Once at the vet, proper diagnosis and treatment, which may include rest, controlled movement, and sometimes surgery, can be initiated. Applying ice and heat alternately can help reduce swelling and stiffness, and gentle massages may relieve muscle tension if appropriate. It is crucial to follow the vet's recovery plan including controlled exercise to promote healing.