YES they do. An abnormal body temperature. Any unusual behavior, such as hiding, restlessness, refusal to eat, or even a refusal to move.
Vocalization is rare, so watching for a change in behavior is vital.
Cats are less demonstrative than dogs, but they sometimes become very friendly or aggressive when they are ill. Animals will occasionally attempt self-mutilation to the painful area. If your pet is exhibiting any of these symptoms, contact your veterinarian immediately. Should your pet be injured, an impaired immune function will cause delayed healing. Today, many drugs are available to help relieve pain.