Why Do Cats Purr? (It’s Not Always Because They’re Happy) A reader brought this to my attention recently, as a comment on my post https://kittynorris.com/3-signs-your-pet-is-your-spirit-animal/As a “cat person” myself, it brings me pleasure to share it. So, here’s a well researched article on the intriguing question: Why Do Cats Purr?