Fur standing on end . Have you ever seen your cat's fur standing on end? You may have noticed that if they run into another cat in your neighborhood, they turn into a giant fluff ball.

Fur standing on end. Credit: Getty Images. Have you ever seen your cat's fur standing on end? You may have noticed that if they run into another cat in your neighborhood, ...

Cats may not yell or throw tantrums like humans, ... Fluffed-Up Fur. Credit: Getty Images. A fully arched back with fur standing on end makes cats look larger to potential threats, ...

During the winter, cats grow what Krebs dubs an undercoat of fur that’s “almost like if you were wearing a down jacket…it's able to trap that heat closer to your body to keep you warm.” ...