Hair in the nasal folds may grow up against the eyeball and rub against the cornea. This tends to be a problem in Poodles, Maltese, Yorkshire Terriers, and in short-nosed breeds such as Pekingese, Shih Tzu, Lhasa Apsos and Bulldogs. In Old English Sheepdogs and other breeds with long facial hair, a similar problem can occur. The involved hair will be stained reddish-brown by tears.
Treatment: The offending hairs should be removed by clipping, or, if the hair is in the nasal folds, by surgery.