Pet trainer

A family adopted a stray cat but, to their distress, the cat used their new sofa as a scratching post.
“Don’t worry,” the husband reassured then, “I’ll have him trained in no time.”
For several days, the husband patiently taught that cat a lesson by quickly depositing him outdoors whenever the cat scratched the sofa. The cat learned quickly.
For the next twelve years, whenever he wanted to go outside, he would add another scratch to the sofa!