 They don't understand when you tell them to shut up. When you're screaming at your dog, your dog thinks that you're doing what, Stacey? Playing with it. Barking. Barking. It thinks you're barking. Oh, great. Now you're barking back. I got him barking too. Woo-hoo. You know, and that's how dogs are. That's what they think. So screaming at your dog is ineffective.