You can make a dog toy mentally stimulating by making it interactive. That means the toy will respond to your dog during playing. An interactive dog toy needs to give your dog some entertainment when it is alone. That way, it will not get bored and start making a mess around the house. The toys need to be soft but durable. They need to give your dog a reason to move. And since your dog will be interacting with the toy, it is best if you can keep its size small. The toy needs to get your dog to make decisions. Whether it is just running after it or looking for it in a pile of leaves, the interactive toy needs to promote your dog’s hunting and foraging instincts. When you give your dog an interactive toy, it is as if you were giving it a job to do, while allowing it to have some fun as well.