If you could make your pet understand one thing, what would it be?

We have three beautiful and loving pets. A cat we call Cookie, a Yorkie named Lillie and a lab mix, Harper.

If I could teach and make them understand one thing it would be —“Please close the *”%’”* door!” All three of them have learned how to open every unlocked door we have in our house but, not one of them has the good manners to close a door!