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I'm only answering this based on experience. It's caused by water or food drying on their face. Because this breed has such a short and flat face topped by long facial hairs, when food and water dries up it leaves a "dirty-mop" smell. I trimmed my dogs facial hair and used a hanging water bottle (similar to that used for hamsters. Hope this helps.

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17y ago

What else can I help you with?