Mickey - my 11 year old rescue - I noticed has black tear stains under his left eye. The other eye is fine. Has anyone experienced this?

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I use to under Vegas's one eye. Take a soft cloth, dip in witch hazel and clean it daily. Don't dry the witch hazel out, leave it on. Vegas's was caused by food allergies. He is now on a grain free Earthbourne Holistic brand food (Lamb). Has done wonder's for him for over two years now. NO tear stains at all.