In fact, if we are alone at home, we may have many choices to kill time, but it is different for dogs. When we are alone at home, it may be quiet around them and there is not much to do, so its owner is its only expectation and concern.
But if you are a dog with more energy, you may have more choices than sleeping and resting, but find something to release energy. For example, it may run around the house, or jump around on the sofa, bite shoes or take things apart.
Although these things look bad to us, these dogs don't mean it. They don't want to be locked up at home alone, but they can't go out, so they have to. Dogs are actually very lonely at home alone. They are eager to see their master, so every time they hear footsteps like their master or the sound of the car engine outside, they may bark or knock on the door, eager to see their master, hoping that the master will not leave himself at home alone.
Dogs actually wait at home for their owners to come back. In an experiment, the monitored dog often went to the window and looked out, hoping to see the owner come back. They sometimes turn around and bark. If their master comes back, they will immediately run to the door to meet their master.