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When should my 8-month-old cat begin heartworm and flea prevention?

Updated on September 23rd, 2025

Pet's info: Cat | Mixed Breed | Female | spayed | 7 months and 19 days old

My cat is almost 8 months old when should start heart worm treatment and flea meds?

1 Answer

Most Helpful Answer

Kevin Sanada, DVM

Answered By Kevin Sanada, DVM

Veterinarian

Published on March 27th, 2018

You can start both of them anytime now. Before starting the heartworm treatment, we recommend having her tested for heartworm. This is important, because if she happened to acquire heartworm (spread by mosquitos), then the preventative medication can cause a bad reaction. Your vet can do the testing and prescribe a preventative.

Below are links to more information about heartworm and fleas.

https://mobile.petcoach.co/amp/article/heartworms-dirofilaria-immitis-in-cats

https://www.petcoach.co/article/the-best-flea-prevention-plan-for-your-cat/

I hope that helps and all is well with Ellie.
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