Does anyone have any tips on how I can get my large dog to stay off the sofa? She knows she's not allowed, and she won't do it if someone is downstairs, but the minute we leave the house, she's on the sofa! She always jumps off as soon as she hears a key in the front door, but we can see her through the window when we are on the porch. Also, if she doesn't sleep in one of our bedrooms, she's on the sofa while we're asleep & jumps off when she hears one of us coming down the stairs in the morning. This is the only behavior problem we have with her, otherwise, she's great.
Any advice?