Chronic stress, or a constant stress experienced over a prolonged period of time, can contribute to long-term problems for heart and blood vessels. The consistent and ongoing increase in heart rate, and the elevated levels of stress hormones and of blood pressure, can take a toll on the body.
Excess Tearing. The most common cause of tear stains in dogs is excess tearing or epiphora, which makes the hair and skin around the eyes damp. This can lead to the growth of bacteria and yeast. Red yeast, which produces a reddish brown discoloration of the face, is a common cause of tear stain problems.
Glands under the skin of your upper eyelids produce tears, which contain water and salt. When you blink, tears spread and keep your eyes moist. Other glands produce oils that keep tears from evaporating too fast or from spilling out of your eyes. Tears are normally discharged through your tear ducts and then evaporate. When you produce too many tears, they overwhelm your tear ducts, and you develop watery eyes. If your tears do not contain the right balance of water, salt, and oils, your eyes can become too dry.