Our Boston Terrier, Maybellene being a frisky, active puppy loves to chase a ball but she is quick to become overheated. One day, she ran across the ac vent, came to a complete, abrupt stop and flopped down on top of it. She had a look of pure joy at discovering such a source of cold air. However, almost immediately, it cut off. The look on her face went from joy to fury and she started biting the vent with all the vigor she had and, believe me, she had a lot of vigor (and still does)!