Can my dog have heartworm disease and at the same time be on preventive medication?

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Can my dog have heartworm disease and at the same time be on preventive medication?

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Yes, but this situation is dangerous. This can occur with inadequate or poorly timed tests while using the preventive. The result is an occult infection which means that adults worms are present but microfilaria are not. Occult infections are just as harmful to your pet as non-occult infections. Routine testing will detect occult heartworm infection.

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