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My dog reacts to meds. Are there safe natural flea/heartworm options?

Updated on September 23rd, 2025

Pet's info: Dog | Mixed Breed Large (61lb +) | Male | neutered | 1 year and 2 months old | 66 lbs

What is the best all natural flea medicine and heart worm preventative? I want to give my dog all natural stuff because lately theirs been dogs having seizures from flea meds and I'm getting worried. he even looks sick every time I give him his monthly treatment. he gets vectra 3D and interceptor plus right now. I also know a lot of natural treatments don't work well. so what should I do? thank you in advance.

1 Answer

Most Helpful Answer

Sarah Derksen, DVM

Answered By Sarah Derksen, DVM

Veterinarian

Published on January 25th, 2018

Hi. Unfortunately there is no "all natrual" and effective flea/tick/heartworm prevention medications. It takes an actual medication and antiparasitic medication to prevent these. The natural products you see when you look in to these are not nearly as effective or studied as those recommended by your veterinarian. This is obviously completely your decision, but from a medical standpoint I do not recommend the all all natural medications or collars for this. If your pet is having reactions to vectra and interceptor, please discontinue them and speak to your veterinarian about other options such as revolution, heart guard, simparica or Brevecto. Good luck.
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