Let your dog outside and smell the world! And don't forget about catering to your dog's nose even when indoors. Offer your dog some games at home under the form of fun treasure hunts. The benefits are many. Your dog will get mental stimulation, will get tired and interestingly, by putting your dog's nose to work also increases your dog's optimism!
Indeed, according to a study, allowing dogs to spend more time using their noses through fun nosework activities makes them more optimistic. By allowing dogs more "foraging" time, their welfare is therefore improved. Win-win!