Make sure your are keeping your pet healthy: Have your pet examined twice a year by your veterinarian. Watch for ear infections, gum problems, yeast or bacterial infections of the eye (especially Red Yeast) and for stopped up tear ducts - (your pet will show signs of dry eyes).
Pet’s Diet: What is he eating? If you see the words “Artificial, Food Additives and Preservatives“ in your pet food, that is most likely the problem. Cereals such as wheat can cause allergies in both cats and dogs which will and can cause tearing. Minerals in some water can also increase tear staining. If this is the cause, you can which your pet to bottled or filtered water and be sure to use a stainless steel bowl.
Keep your Pet’s Eyes Clean: Hair in the eyes will cause irritations and it feels very bad and will make the eye tear. Eyelashes can grow at abnormal angles and poke the eye, so ask your groomer to trim up that area.
Wash your pet’s face frequently if he is prone to getting dirty. Comb out the hair when it is wet and slippery to remove eye matter. Keep the shampoo out of their eyes to avoid irritation and if you do get soap in the eyes, rinse with clean water immediately.
NuVet Plus Supplements are great for this problem as a preventative.