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I have personaly experienced cherry eye in cats several times. Every time on an Exotic Shorthair cat and unilateral.
The mucosal pocket technic was curative.
Use boric acid or citric acid (can be found in contact lenses or liquid vitamin C) on a cotton ball to wipe the dogs face and lighten the tear stains (2 dd). boric acid or citric acid would oxidize porphyrin iron and lighten them. Sunlight makes the stains darker.
Tell to the owner to use stainless steel, porcelain or glass food bowl. Plastic food bowl will harbor the bacteria and cause facial irritation. Use bottled or use a filter to make cleaner water, because tap water contain high mineral or iron.
Prescribe antibiotics such as doxycyclin, metronidazole, enrofloxacin and oral multivitamin / supplement.
I do not recommend to use teramycin, apple cider vinegar, make up remover, yogurt, or hydrogen peroxide to remove the stains.