The Georgia-based distributor of immiticide, the only drug approved by the Food and Drug Administration to treat heartworm in dogs, has run out of the medicine since the manufacturer temporarily ceased production. Distributor Merial notified veterinarians of the shortage in early August and said it is searching for a new supplier, but the process could take months. Missouri veterinarian Mark Hale says only about 40% of the dogs he sees are on a heartworm preventative and his practice only has enough immiticide to treat one more patient.

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