Boredom is a deadly enemy for dogs, especially when you leave them alone at home or in the garden for too long. Especially in young dogs and certain breeds that are "working" dogs, i.e. dogs that have been selected for generations for high activity levels, but also crossbreeds that generally have the effect of genetic reinforcement, boredom can set in after just a few hours, especially if the dog has not been doing anything before. After a period of waiting and rest, the dog begins to become restless, so it needs to keep its mind occupied with some activity. In general, dogs that are in the garden may start digging or destroying plants, and it is not uncommon for them to make holes in the fence to get out. Dogs that are always indoors may bark, empty rubbish bins, knock over objects, or chew on furniture. In general, the less activity the dog has had prior to the owner's departure, or throughout the day, the greater its emotional sensitivity, for a very simple reason. Physical exercise releases endorphins, and satisfaction from motivation at work has a serotonergic effect: it is therefore a form of self-calming that the dog experiences during activity. We can therefore say that increasing the dog's activity in all these situations is beneficial, as it reduces restlessness and emotional sensitivity.