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  • Exposure to the sun is the most common cause of black spots in dogs skin and fur. Aging is also known to cause dark spots in canines (age spots). Friction can also cause dark patches in areas such as armpits and under the legs.
+5 votes
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  • Exposure to the sun is the most common cause of black spots in dogs skin and fur. Aging is also known to cause dark spots in canines (age spots). Friction can also cause dark patches in areas such as armpits and under the legs.

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