Cats have several ways to communicate that they are feeling stressed out. If you're wanting to monitor your feline friend for signs of anxiety, watch out for them constantly biting at themselves, having accidents around the house, physical shaking, yowling or excessively meowing, and any loss of appetite. Of course, these symptoms could also be the result of a variety of medical issues, so don't simply brush them off as stress before having your feline friend checked by a veterinarian.