Suppose you and your pet (big dog/cat/whatever) get locked up in a dungeon and there is no way out (!!!!). You only get fed one small bowl of watery vegetable soup a day, which is nowhere near enough for your pet, much less both of you or even you yourself. Eventually you'll both starve to death. As time goes by, how do you distribute the soup? Half for your pet? None for your pet? Would you give your pet up to starvation to keep yourself alive a little bit longer?