One man created an ingenious way to keep his cat fulfilled as a hunter. Plastic balls are hidden throughout the house. His cat must find them, carry and drop into his feeder to receive his food.
What a spectacular invention! Imagine this for your dog, especially a dog that is left alone to his or her own devices while you are at work. You could keep your pet mentally and physically active.
It requires a bit of training, which is provided by this fulfilled cat's owner. Although, I think training a dog to do this would be much easier than a cat. Have you ever tried to train a cat?!