There's an old expression: It's best to let sleeping dogs lie. But what if your dog is having a nightmare? Should you wake them up? And how do we even know what dogs are dreaming about? Sherri talks with dog trainer Shaun Harnack about how to set up the best environment in our home for dogs to have restful sleeps. Then Sherri talks with Harvard psychologist Dr. Deirdre Barrett about dreams and what we think might be happening when a dog is snoozing. Do they count sheep? Listen to find out.