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You can try Forza10 Sensitive Tear Stain Plus Grain-Free Dry Dog Food.

If your pet’s tearstains are dark red, they are the result of porphyrins, which are iron-containing waste products from the breakdown of red blood cells that can be excreted in tears and saliva. If the stains are brown in color, it indicates a yeast infection on the face. See your vet before treating it.

Avoid products containing antibiotic tylosin tartrate.