Did you know that a cat that roars (and that's a big one), can't purr? The purr has long mystified scientists and is still being researched and explored. One of the biggest misconceptions of cat caregivers and veterinary teams alike is that cats only purr when they feel good. Let's set the record straight once and for all! Dr. Margaret Gruen, professor of behavioral medicine at NC State College of Veterinary Medicine, is back to help us decode one of the most elusive sounds in the animal world today!