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My dog is itching after Frontline flea spray. Is it the treatment?

Updated On September 23rd, 2025

Pet's info: Dog | Chihuahua (Smooth Coat) | Male | unneutered | 3 months and 27 days old | 6 lbs

I treated both my dog and cat with frontline spray for fleas. My dog has been itching more since he was treated yesterday. My cat doesn’t seem to have a problem. There are no visible signs of fleas in either pet or in the house. What could it be?

1 Answer

Most Helpful Answer

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Answered By Dr. Strydom, DVM

Veterinarian

Published on June 12th, 2019

The Frontline Spray may be irritating the dog's skin or the itching may be completely unrelated. I cannot tell you. Maybe he has an underlying allergy? Please be advised that Frontline spray only provides short term flea treatment (like 24 hours or less). The animals need monthly flea prevention with a product that lasts all month. I suggest you go to your local VETCO clinic (inside Petco) and consult with them about flea prevention for both the cat and the dog. Take the animals with you when you go or they won't be able to help you. ( https://www.vetcoclinics.com/services-and-clinics/clinic-locations-and-schedules/?zip=95348 )

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