I have never had personal experience with heartworm. But I do know that the earlier it is caught, the milder the case and the shorter the recovery time. The other thing I know is that keeping the dog inactive is very important. In severe cases, they should be crated to avoid activity.
Have you consulted a vet, or are you just following the shelter's instructions? If the latter, I would take your dog to a vet for another opinion.
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