I’m not sure it’s possible to own a dog these days and not know what a Kong is! But just in case, these are chewable toys that you can stuff with treats, or even your dog’s meal, and they spend time licking and chewing it, which releases endorphins in your dog’s brain, keeping him calm and happy. For an extended session (or during the summer) you can freeze the stuffed kong before handing it over.
Kongs come in a variety of sizes and durability to suit your pooch. Look for pink and blue for puppies, red for adults, and black for power-chewers!