A: Give the dose you missed immediately, then continue giving the medication on the day you've always given it. If the missed dose is more than 2 weeks late, your dog should be tested for heartworm again in six months (click here to learn why).
Can Heartgard be given late?
The final dose must be given within a month (30 days) after the dog's last exposure to mosquitoes. When replacing another heartworm preventive product in a heartworm disease preventive program, the first dose of HEARTGARD Plus must be given within a month (30 days) of the last dose of the former medication.
What happens if you forget to give your dog heartworm medicine?
A dog who has missed just two monthly doses of preventative or is late for a heartworm injection can become infected with heartworms.
How late can I give my dog heartworm?
Less than 2 weeks: Give your dog the missed dose immediately. Your dog will be protected from heartworm disease because you will still be within the 45-day grace period in which the preventative is effective.
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