Tear stains are a dark reddish-brown colored stain that appear at the inner corners of a dog's eyes, and usually continue down the side of their cheeks.  This usually is most obvious on white or light-colored dogs, but also occurs in Shih Tzu, Pekingese, Pomeranians, and Yorkies, to name a few.  It is not only unsightly, but can also lead to discomfort and health issues in your dog.  To a large e…