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When to start puppy heartworm, flea, tick meds & stop dewormer?

Updated on September 23rd, 2025

I bought Nemex-2 to start deworming puppies at two weeks old. I was looking up other things that puppy need to take and I saw that they needed heartworm, flea and tick prevention. At how many weeks should I start giving heartworm chewables and stop the Nemex-2 since it also contains pyrantel? Also, for the flea and tick prevention chewables, which one is best and also at how many weeks old should I start it for them or should I buy the ones that are just applied to their coat?

1 Answer

Most Helpful Answer

Laura Johnson VMD

Answered By Laura Johnson VMD

Veterinarian

Published on February 14th, 2018

Hi, thanks for using Petco Pet Education Center, formerly Petcoach!

We don’t start heartworm and flea/tick prevention until around 8 week of age. Nexgard is the only oral flea and tick preventative approved in the US for 6 months or younger. I would continue the Nemex every 2 weeks until they start heartworm prevention.

I hope this helps!
Vote Icon1Pet Parents found this answer helpful

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