Okay, that title is a bit misleading – this is more like “teaching doors to close behind cats and dogs.” :-)
Do you have an animal in your house that knows how to bang open a door from one room to the next? If you are trying to keep the air-conditioning in or cold drafts out it’s annoying when they barge through and leave the door swinging wide open (think of showering in a steamy bathroom in winter, when BAMM! there’s a cat wanting your attention followed by a blast of cold air…).
Here’s a simple trick to mitigate that problem: