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My dog has flea treatment, but still has fleas. What should I do?

Updated On September 23rd, 2025

Pet's info: Dog | Border Collie | Female | spayed | 10 years and 3 months old | 28 lbs

My dogs have spot on flea and tick treatment on. They are on their 2nd month of treatment yet they have fleas? I’ve tried different types including frontline which I stopped using for the same reason.

2 Answers

Most Helpful Answer

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Answered By Dr. Elizabeth

Veterinarian

Published on June 25th, 2019

If you are noticing continued problems with fleas despite treatment every month, it's possible the fleas have developed an immunity to the current product. I recommend switching the products. Top products for dogs are oral products such as Simparica and Nexgard. Top products for cats are topicals such as Revolution and Cheristan. There is also an oral product called Comfortis that both dogs and cats can take. You will need to switch all the pets over to a good flea product. Make sure to discuss these products with your veterinarian first. These products are generally safe for all pets but there are some conditions which are contraindicated for the oral products. Cleaning up and treating the house and yard will also help but it will not clear all the fleas. The main control is making sure the pets are on good products. This is what will ultimately stop the infestation. Also remember every female fleas lays about 50 eggs a day and it could take up to 6 months before the eggs hatch. Therefore, you will need to treat for at least 6 months. Best of luck and please feel free to post any additional questions.

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2Pet Parents found this answer helpful

Other Answers

  • Image profile

    Answered By Dr. Elizabeth

    Veterinarian

    Published on April 2nd, 2020

    If you are noticing continued problems with fleas despite treatment every month, it's possible the fleas have developed an immunity to the current product. I recommend switching the products. Top products for dogs are oral products such as Simparica and Nexgard. Top products for cats are topicals such as Revolution and Cheristan. There is also an oral product called Comfortis that both dogs and cats can take. You will need to switch all the pets over to a good flea product. Make sure to discuss these products with your veterinarian first. These products are generally safe for all pets but there are some conditions which are contraindicated for the oral products. Cleaning up and treating the house and yard will also help but it will not clear all the fleas. The main control is making sure the pets are on good products. This is what will ultimately stop the infestation. Also remember every female fleas lays about 50 eggs a day and it could take up to 6 months before the eggs hatch. Therefore, you will need to treat for at least 6 months. Best of luck and please feel free to post any additional questions.

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    1Pet Parents found this answer helpful

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