* Bad breath or drooling
* Excessive drinking or urination
* Appetite change associated with weight loss or gain
* Change in activity level (e.g., lack of interest in doing things they once did)
* Stiffness or difficulty in rising or climbing stairs
* Sleeping more than normal, or other behavior or attitude changes
* Coughing, sneezing, excessive panting, or labored breathing
* Dry or itchy skin, sores, lumps, or shaking of the head
* Frequent digestive upsets or change in bowel movements
* Dry, red, or cloudy eyes
If your best friend shows symptoms of being ill, you should contact your veterinarian immediately.