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Because heartworms must be eliminated before they reach this adult stage, it is extremely important that heartworm preventives be administered strictly on schedule (monthly for oral and topical products and every 6 months or 12 months for the injectable).
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What months should I give my dog heartworm medicine?

  • The mosquito picks up heartworm microfilariae by biting a heartworm-infected animal.
  • Microfilariae grow into larvae in the mosquito.
  • The mosquito with heartworm larvae bites your dog,leaving larvae in him.
  • Over about 6-7 months,the larvae can grow into adult heartworms in your dog.

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