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How Long Is Ringworm Contagious?. Part of the series: Canine Health Facts. Ringworm is contagious so long as there are any active spores left to grow on the surface of the animal's skin. Treat ringworm using an anti-fungal medication with helpful information from a practicing veterinarian in this free video on pet care. Read more: www.ehow.com/video_4908341_lon...