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Is my dog's positive ehrlichiosis snap test a false positive result?

Updated on September 23rd, 2025

Pet's info: Dog | Mixed Breed Large (61lb +) | Male | neutered | 10 years and 2 months old | 72 lbs

My dog was diagnosed with ehrlichiosis by the in-house snap test which came out positive. Yet his red and white blood cell counts and platelet counts are perfect on his blood tests. Can this snap test for the disease be wrong?

1 Answer

Most Helpful Answer

Lindsey Edwards MVB, BSc, IVCA

Answered By Lindsey Edwards MVB, BSc, IVCA

Veterinarian

Published on June 24th, 2017

It is possible but very rare for the test to be wrong (false positive) - repeat testing in 2-3weeks would provide more information. The test looks for antibodies (made by the dogs immune system in response to infection), some dogs become what is termed 'sub-clinical' - infected but without any clinical signs or alterations in blood cells, a phase which can last months or years before signs of disease are detected; regular blood counts should be considered to monitor for changes in such cases
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