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A. It is unlikely that the food itself is causing the tear production but certain diets can affect the pH or acidity of the tears and promote bacterial and yeast growth allowing discoloration of facial tear stains. Blocked tear ducts and entropion or inturned eyelids irritating the eye are common causes of increased tearing in Shih Tzus and you should get these checked especially of there is any squinting or discomfort
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