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My dog was exposed to Parvo. Is he at risk if his vaccine expired?

Updated On September 23rd, 2025

Pet's info: Dog | Mixed Breed Medium (23 - 60lb) | Male | neutered | 4 years and 4 months old | 25 lbs

Hi. My 4 year old dog was exposed to Parvo. His Parvo vaccination booster just expired 6 weeks ago. I am unsure if my dog came in contact with bodily fluids from the contagious dog. We are bringing him to our vet for the booster shot this week. Is my dog at serious risk of contracting the virus?

1 Answer

Most Helpful Answer

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Answered By Amy S. Eutsey, DVM

Veterinarian

Published on June 12th, 2018

Hello. I think that Stewie has little risk of becoming ill from contact with this puppy. Adult dogs, especially those that have been vaccinated, usually have good immunity against Parvovirus. The fact that his vaccine “expired” 6 weeks ago is not as critical as you may think. It is likely that he still has adequate protection against the virus. Certainly you will want to monitor him for anotexia, lethargy, vomiting and diarrhea, but I really think he will be just fine. Thank you for using Petco Pet Education Center, formerly Petcoach.

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