As a disciple of the Supreme Buddha, what would you do with an animal that is in severe pain?

You may get to see someone or an animal is sick and suffering in pain. You may be able to give that person or animal a medicine that helps relieve the pain somewhat. But sometimes there’s so much pain that it goes beyond the reach of any morphine, any opium, any painkiller at all. At such moments what would be your thoughts? Being well informed of the Dhamma, you know in the back of your mind that it is our responsibility for what we are. We were the ones who chose to be born here. It was because of our desires and our cravings that we took birth as human beings or animals for that matter. When you’re responsible for your birth, then you also have to be responsible for how you handle your aging, illness, and death. They all come as part of the same package. So how could you be of help to self and the other in such a situation?