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When to start heartworm & flea/tick meds for dogs after negative test?

Updated On September 23rd, 2025

Pet's info: Dog | Golden Retriever | Female | spayed | 65 lbs

My 2 senior dogs passed their heartworm tests. When should I start their Heartgard & Frontline Plus? We live in SE Wisconsin and temperatures are still varying between 30-60 degrees.

1 Answer

Most Helpful Answer

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Answered By Linda G, MS, DVM

Veterinarian

Published on March 31st, 2019

Hello. You want to start heartworm prophylaxis with 30 days of a negative heartworm test. Ticks & fleas can definitely survive your temperature range, so go ahead & start using your Frontline to get a head start on the warm weather parasite explosion. Thanks for using Petco Pet Education Center, formerly Petcoach.

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