Which breed is sometimes noted as potentially having markings resembling 'heavy black eyeliner' around the eyes?

Answer

The Norwich Terrier

One observation notes that the Norwich Terrier may appear to have a more defined, darker outline around the eyes, sometimes described as looking like heavy black eyeliner, compared to its Norfolk cousin.

Which breed is sometimes noted as potentially having markings resembling 'heavy black eyeliner' around the eyes?

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Norfolk Terrier vs Norwich Terrier - Differences

Norfolk Terrier Vs Norwich Terrier - What are the differences

NorfolkDogbreedTerrierNorwich