Our young daughter had adopted a stray cat. To my distress, he began to use the back of our new sofa as a scratching post. "Don't worry," my husband reassured me. "I'll have him trained in no time."
  
I watched for several days as my husband patiently "trained" our new pet. Whenever the cat scratched, my husband deposited him outdoors to teach him a lesson.
  
The cat learned quickly. For the next 16 years, whenever he wanted to go outside, he scratched the back of the sofa.