There's no nightmare worse for any pet owner than losing your pet. Realizing that they're not home, shaking their food and them not coming. I've been there, and I had my baby baby kitty come back to me the following day - exactly 24 hours later. And though those 24 hours were some of the worst I can remember, having her come back was the happiest moment in the world.
Same thing happened with this young boy who, after finishing with the school day, walked over to the car to be picked up and was shocked to find that the dog he had lost was waiting for him. Tail wagging and a bow tied like a collar, the dog's tail starts wagging immediately, the boy is shocked, and then, we're all crying tears of joy.