You walk in the door and call your dog in a friendly voice. She comes running and jumps up to lick your face.

Your tone changes from friendly to harsh as you yell at her, trying to teach her not to jump up. Confused and trying to please, she keeps jumping up. She doesn't understand it's the jumping that's the problem. And you don't understand why she doesn't get it.

When dogs don't understand our instructions, they often become anxious and less teachable. Be sure your dog knows specific words so you can shape behaviors when they are aroused. If your dog jumps on you, turn your back and say, "Sit!" When your dog sits, then crouch down quickly to praise the sit and enjoy a nice greeting instead of muddy paws on your shirt.

Animal behavior experts Susan and Roland Tripp are the authors of "On Good Behavior." For more information, visit their Web site at AnimalBehavior.net.