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My dog's heartworm test was negative but showed a faint positive line?

Updated On September 23rd, 2025

Pet's info: Dog | Schnoodle | Male | neutered | 3 years old | 20 lbs

Hi There! Today at the vet my dog tested negative for heartworms but there was a faint line for positive? This has happened in the past when we first adopted him but came back fully negative when sending it off for further testing. Help!

1 Answer

Most Helpful Answer

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Answered By Destini R. Holloway, DVM

Veterinarian

Published on February 23rd, 2019

Thats interesting. I have never seen that happen in a dog. However, I would suggest just having your pet Saint's test sent out from here on our so that you don't have to go through this initial scare, when things seem to be just fine. The snap test is just a screening test, which is usually pretty accurate, but there is still some small % of error there. But as long as the send out one comes back negative, we count on those results since they are a bit more reliable. Best wishes with your pet Saint moving forward! Take care. : )

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