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There are several pet owners who experience tear stains under their pet’s eyes more than often. On the other hand though, there may be people who have never witnessed tear stains before. These pet owners may not know what to do in the event of a tear tain appearing, but it is best that they learn about exactly what causes them. The appearance of tear stains under the eyes of your favorite pooch don’t necessarily mean that the dog is unhealthy or under the weather in any kind of way. Tear stains are caused by a physical trait that is usually seen in small dogs. It is almost expected for dogs of small breeds to experience a tear stain or two because they are known for their clogged tear ducts. If the tears can’t drain properly, people may begin to notice a reddish-brown stain showing up under their dog’s eye. A tear stain gets its reddish hue from the red yeast bacteria that are formed by moisture from the tears.