1. Suppose you see your neighbor's ox or sheep wandering away. Then don't act as if you didn't see it. Instead, make sure you take it back to him.
2. Your neighbor might not live near you. Or you might not know who he is. Then take the animal home with you. Keep it until he comes looking for it. Then give it back.
3. Do the same thing if you find his donkey, coat or anything he loses. Don't act as if you didn't see it.