After the dog got on the sofa, he fell in love with the sofa and became close to people. When the owner is away, some dogs will get angry and think that the owner has not taken him out and will pee on the sofa to protest. So when the owner goes out, he can tie the dog to a corner he likes at home, so that after several times, when the owner is not at home, he will know that it is his place. Will be very obedient and stay there.