Give Your Dog A Job
Stimulate your dog’s mind by giving him a “job” to do. Working dogs such as guide dogs, herding dogs, police dogs etc. have their task that they love to fulfill regularly, but even a companion dog can have a simple job that the owner came up with.
For example, maybe your dog could wear a dog backpack sometimes? Granted that he is healthy and otherwise capable to do it. Start with an empty backpack and gradually add some weight to it if you want. According to my research the weight limit is 10% of your dog’s body weight. Never make your dog carry too much weight, because it will cause health issues.
If backpack is not something your dog would like to carry around, consider coming up with some other task that your dog could do. If your dog is healthy and on the larger side, maybe he would enjoy pulling a cart, for example.