How late can I give my dog heartworm?

【Expert answer】

Created: 2022-05-27 18:21:11

Any Q

Most of the monthly heartworm medicines have a safety factor of at least 15 days of protection if a dose is missed. This means that if you're just a week or two late, your pet is likely still within that window of protection and would be unlikely to become infected during that time.

Can I give my dog heartworm medicine late?

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).

How late can you give 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.

How late can I give my dog Heartgard?

The final dose must be given within a month (30 days) after the dog's last exposure to mosquitoes. When replacing another heartworm preventive in a heartworm disease preventive program, the first dose of HEARTGARD must be given within a month (30 days) after the last dose of the former medication.

What happens if I forget to give my dog his heartworm pill?

A dog who has missed just two monthly doses of preventative or is late for a heartworm injection can become infected with heartworms.

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