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Why does my dog still have fleas on Trifexis and is so itchy?

Updated On September 23rd, 2025

Pet's info: Dog | Mixed Breed Medium (23 - 60lb) | Male | neutered | 10 months and 5 days old | 35 lbs

My dog has been on Trifexsis for 5 months now and I am still having flea problems. I washed him the other night and got 40 fleas off. Also, he's biting, scratching and licking himself constantly. What should i do?

1 Answer

Most Helpful Answer

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Answered By Dr. Heidi DVM, CVA, CCRT, CVTP, CVSMT, CVCH

Veterinarian, Certified Veterinary Acupuncturist, Certified Canine Rehabilitation Practitioner

Published on June 6th, 2018

Trifexis has a product guarantee if you purchased it from your vet, so I would recommend contacting your vet to get the guarantee started and decide on a treatment plan for the fleas. I am attaching a link about the guarantee below. https://www.trifexis.com/about-elanco/our-guarantee Since Pierre is so itchy, I would recommend having your veterinarian examine him to see if he needs any medication for the itching to make him more comfortable while the fleas are being treated. Good luck! I hope that was helpful. Thanks for using PetCoach.

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