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How Long Does Dog Parvo Last in Your Home or Yard?

Adrienne is a certified dog trainer and former veterinarian assistant who partners with some of the best veterinarians worldwide.

What you should know about parvovirus

What you should know about parvovirus

My Dog Survived Parvo, Now What?

If you own a puppy who has or has had parvo, you may be concerned about eliminating the infective virus from your pet's environment. Your concerns are very reasonable since parvo is deadly to vulnerable pups, and it survives quite a long time in your home and in your yard. First, let's take a closer look at this virus and how it infects dogs so we can better understand the dynamics and take better precautionary methods. Think you know a whole lot about dog parvo? Try to test yourself through the trivia quiz at the bottom of this article.

Parvo derives from the Latin word "parvus," which means small. Measuring in at only 20 to 26 nanometers in diameter, this is one of the smallest viruses on earth. It's likely because of this virus' small dimensions that it was recently discovered in 1967 and labeled as CPV-1. Eleven years later, in the United States, another strain emerged and was called CPV-2.

The virus was considered a mutation of feline panleukopenia, which is also a parvovirus. This virus mostly affected canines—that included wolves, coyotes, and foxes and attacked the gastrointestinal tract of dogs. Later on, CPV-2a was identified in 1979, then CPV-2b, and finally CPV-2c, which so far has been identified in at least 15 states and appears to be the most prevalent form.

While it's disturbing that there are so many different strains, the good news is that regardless of the strain, vaccination protocols remain fairly the same and so does treatment. And the time frame that parvovirus survives in the environment, such as in your home and yard, remains pretty much the same across the strains.

What Makes a Puppy Vulnerable to Parvo?

Are you planning to get a new puppy, and you're worried about parvo in the environment because a sick puppy lived there before? Learning how puppies are vulnerable to parvo and how to minimize the chances for exposure is important.

Method of Exposure

In order to get infected, the puppy must be exposed to the viral particles found in feces, infected soil and anything that can carry the virus around, such as shoes, car tires, the dog's paws, etc. The virus is transmitted through the fecal-oral route. This doesn't mean your puppy necessarily has to eat the feces of an infected dog; your puppy can get parvo by simply licking his paws after walking on contaminated soil or the sole of your shoes (fomites).

He can also get it from eating food off the ground and consider that even insects or rodents may transport the virus from place to place. Puppies diagnosed with parvo should be isolated for at least three weeks before frequenting areas populated by dogs, suggests veterinarian Lila Miller. Best to consult with your vet to determine when it's a good time to reintroduce your puppy.


Puppies are the most predisposed to this virus, and while adult dogs may get parvo too, 80 percent of them do not show any symptoms. Puppies between the age of age six weeks to six months appear to be the most affected. For unknown reasons, certain black and tan breeds appear to be more predisposed to this virus such as Rottweilers, German Shepherds and Dobermans, but so are pit bulls, Alaskan Sled Dogs, English Springer Spaniels, and Labrador Retrievers.

Whether a pup gets infected or not may also depend on the virulence of the virus, the amount of viral particles the puppy is exposed to, his overall level of immunity (stress, poor diet, the presence of other infections are predisposing factors).

Preventive Steps


Puppies should be vaccinated when still in the breeder's hands around 6 to 8 weeks of age when the immunity derived from mother dogs starts to wear off (passive immunity). Once the puppy goes to his new home, it's crucial that the new owner takes over and continues vaccinating the puppy every 3–4 weeks until the whole series is completed. Generally, after the breeder gives the initial shot, puppies are given boosters at 10–12, and 14–16 weeks. Consider that protection doesn't take effect immediately; it takes about 10 to 14 days post-vaccination for adequate protection to develop.

In some areas, or if you have a predisposed breed, your vet may suggest an additional booster around 20 weeks. Yet, the puppy is not safe until they have completed the whole vaccination series. Safe though isn't the best term to use in vaccinated dogs who have completed the series. Veterinarian and immunology expert Jean Dodds points out:

"No vaccine produces 100 percent protection 100 percent of the time. It certainly improves the odds that an animal will be protected from disease, but it does not guarantee this."

Deworming and Fecal Tests

As mentioned, puppies that have a compromised immune system and are fighting other conditions are more susceptible to parvo. Veterinarian Lila Miller points out how puppies with roundworms or protozoans such as coccidia are more susceptible to parvo. Feeding a good diet and limiting stress is helpful too.

Limiting Exposure

It's important that puppy owners prevent their puppy from frequenting high risks areas such as parks, pet stores and areas frequented by stray dogs. This is at least until the puppy has completed the whole series of boosters and the vet approves it's safe to do so.

Yet, coincidentally during this time, puppies need to be socialized as between 4 and 12–16 weeks of age, the critical socialization window is open. Read the American Veterinary Society of Animal Behavior position statement on Puppy Socialization for some guidelines on how to find a compromise between safety and the need for socialization.

If you are concerned about the parvovirus in your home and yard because a puppy with parvo has shed the virus, read on for expert guidelines.

How to kill dog parvo virus from yard and home

How to kill dog parvo virus from yard and home

Can a Puppy Who Had Parvo Get It Again? What the Vets Say

If you have a puppy who survived parvo, you may be wondering if puppies can get parvo twice. Let's see what the vets have to say about this.

  • Veterinarian Dr. Marie Haynes claims, "In my experience, it's quite rare for an animal to get parvo twice in their lifetime. They will have developed some antibodies against the disease which will protect them for some time."
  • VeterinarianRon Hines claims, "A dog that has recovered from a confirmed parvovirus infection is immune for the rest of its life."
  • According to Timpanogos Animal Hospital, "Recovered parvo patients develop a very strong immunity to parvo and are extremely unlikely to ever develop parvo again. However, it is critical that your pet is vaccinated against other infectious diseases. Vaccinations are usually given 1–2 weeks after recovery and continued at appropriate intervals as directed by your veterinarian."
  • VeterinarianEric Barchas claims that there's no 100 percent guarantee, but "most dogs that live through parvo develop permanent immunity."
  • According to Wendy C. Brooks, "A puppy that has recovered from a parvovirus infection can be expected to have strong immunity. This has been tested out to 20 months after infection and immunity is believed to be lifelong; because this is unproven, continued vaccination is commonly recommended."

Eliminating Parvovirus From the Home and Yard

A Shedding Machine

An infected puppy sheds parvovirus particles in his feces, even before showing clinical signs, about four to five days after exposure. The puppy will shed virus particles in enormous amounts for three weeks, but it's possible even up to 6 weeks. If you're wondering what enormous amounts means, consider this: According to Mar Vista Vet Animals Hospital, an infected puppy is capable of shedding about 35 million viral particles in just an ounce of stool! And all it takes for an unvaccinated puppy to get infected is just 1000 viral particles. Don't think that after this 3 to 6 week shedding time, other puppies and dogs are safe! Once shed, the virus can survive for a long time in the environment.

Cold/Hot Weather Survivor

Sadly, the parvovirus is extremely hardy and difficult to eradicate. It's capable of surviving hot or cold temperatures. The virus tends to thrive the most though in moist, cool and shady areas. And don't expect this virus to die from freezing temperatures; cold temperatures won't kill parvo, explains veterinarian Janet Tobiassen Crosby. The virus is actually capable of overwintering in freezing temperatures. At the same time, don't feel safe if you live in a hot climate; this virus can live well as well, especially in the shade.


The parvovirus is often described as being "ubiquitous." This term means omnipresent, basically being found everywhere. Veterinarian Wendy Brooks points out, "This means that NO ENVIRONMENT is free from this virus unless it's regularly disinfected." So if you are disinfecting your home and yard, don't forget to also disinfect the garage and entryways!

A Hardy Virus

Not only does the virus survive in adverse climate conditions, it's also quite long living. According to Utah Veterinary Clinics, parvo can live in the environment for six months to one year. The time frame seems to depend on several factors. According to Wendy Brooks, when no decontamination steps are taken in shaded areas, the virus is expected to live for about 7 months; whereas, in areas with full sun exposure, it shouldn't live more than 5 months.

Yet, it's better to be safe than sorry, and consider that according to the American Veterinary Medical Association, parvo can live in the environment for one year or more. The good news, though, is that indoors, the virus has a shorter lifespan. According to the Merck Veterinary Manual, at room temperature and indoors, the virus may be infectious for at least two months.

Resistant to Products

Don't just assume you can kill this virus using any household disinfectant product you have on hand. Parvovirus requires a specific concoction in order to be subdued. The secret product is bleach, one part bleach to 30 parts of water to be exact. In order to be effective, it should be allowed to soak in at least 10 minutes, according to Mar Vista Vet. Keep in mind that the bleach tends to remove colors from surfaces like carpets, rugs, blankets and upholstery.

Impossible to Completely Remove

The scariest fact about parvovirus is that despite your cleaning efforts, the complete destruction of parvo from an outdoor environment is close to impossible. Yes, you can dilute the viral particles by hosing down the lawn if you have drainage, or you can use a spray hose delivering disinfectants, but most likely, you'll just be reducing the number of particles around, hopefully to the extent of reducing their numbers to an acceptable level, but no guarantees can be made.

The Best Option?

Parvo is a devastating disease with low survival rates. It makes puppies miserable, and the costs of hospitalization can easily amount to thousands of dollars. Disinfecting indoors, even though it can be effective, it may be impractical since bleaching may mean ruining carpets, rugs and upholstery.

The bottom line? It's ultimately much more simple to wait to get another puppy or do what the Merck Veterinary Manual suggests: getting one that has already completed the entire vaccination series or, even better, getting a vaccinated adult after having disinfected the environment. Doing a titer test to see if there's a presence of sufficient parvo antibody is important. This is the best option to prevent future heartaches as the risks at are stake are ultimately too high to take risks.

Dog Parvovirus Trivia

For each question, choose the best answer. The answer key is below.

  1. Why do young puppies need multiple vaccines?
    • Because the milk puppies ingest is rich in antibodies which interferes and makes vaccines temporarily ineffective
    • For convenience since puppies may need to be dewormed several times too
    • Because vets make more money this way.
  2. What are fomites?
    • A type of pest that infests wood.
    • Objects that can carry a pathogen
    • Dangerous viuses that infest foam
  3. What breeds are more likely to get parvo?
    • Shelties
    • Rottweilers and Doberman
    • Dachshunds
  4. What product would you use to disinfect contaminated areas?
    • Diluted bleach
    • Quaternium
    • Chlorhexidine

Answer Key

  1. Because the milk puppies ingest is rich in antibodies which interferes and makes vaccines temporarily ineffective
  2. Objects that can carry a pathogen
  3. Rottweilers and Doberman
  4. Diluted bleach

Interpreting Your Score

If you got between 0 and 1 correct answer: Be careful, you need to learn some more!

If you got 2 correct answers: You're getting there!

If you got 3 correct answers: You did a fairly good job overall.

If you got 4 correct answers: Wow, you really know your stuff, good job!

This article is accurate and true to the best of the author’s knowledge. It is not meant to substitute for diagnosis, prognosis, treatment, prescription, or formal and individualized advice from a veterinary medical professional. Animals exhibiting signs and symptoms of distress should be seen by a veterinarian immediately.

Questions & Answers

Question: How do I know if my dog has parvo?

Answer: Parvo in dogs can be quickly diagnosed (in just under 8 minutes) by having the vet perform a SNAP Parvo Test in the vet's office.

Question: What is a titer test?

Answer: When it comes to parvo vaccination, a titer test such as the one provided by Vaccicheck can help determine a dog's antibody level to Parvovirus (CPV) along with distemper and hepatitis. A titer test may, therefore, be helpful in determining a dog's vaccination status, and prevent problems associated with over/under vaccination.

Question: Can my dog get distemper if he had suffered from parvovirus before?

Answer: Yes, as these are two different conditions. However, if your dog is current on his core vaccinations, distemper is less likely.

Question: Can an adult dog be brought into a home that had a puppy with parvo?

Answer: Adult dogs are less likely to contract parvo, however it is not unheard of for them to get it too. This can likely happen in dogs who haven't been immunized (lack of acquired immunity) or who have a weak or compromised immune system. A dog of any age can get parvo, but it's not as common in puppies for the fact that most adult dogs were given a series of shots against parvo as puppies and then booster shots throughout their adult years. If the adult dog is current on his parvo vaccination, the chances for contracting parvo should be quite slim, but it's always best to check with a vet on this especially if you do not have medical records for this adult dog.

Question: How can you remove parvo from your backyard?

Answer: Removing parvo completely from the yard can be challenging for obvious reasons. Several vets say it is close to impossible, unfortunately. You can reduce numbers by removing any feces and using a diluted bleach solution (one part bleach to 30 parts of water) to clean hard surfaces. Dirt and grass can be sprayed with the diluted bleach solution, however, it's important to understand that bleach will kill grass and that parvo may still be present in the yard. Shoes should be disinfected too after walking in the yard.

Question: How do I know if my roommate's dog has parvo?

Answer: A dog with parvo will typically show signs of illness such as vomiting, foul-smelling diarrhea, lethargy, and abdominal pain. However, these signs may be seen in many other disorders so they aren't pathognomonic for parvo in particular. The only sure way to know if a puppy has parvo is by visiting the vet and having the vet run an ELISA (or the Parvo Snap test) by using a fecal sample and on top of that doing a blood test. A positive Elisa test accompanied by a complete red blood count showing leukopenia (low white blood cells) and neutropenia (low neutrophils), is likely diagnostic for parvo.

Question: How quickly does a dog show signs after being exposed to Parvo?

Answer: The incubation period for parvo (the time it takes for a dog to show symptoms after exposure) is generally anywhere between 3 and 14 days. Exposure may be directly (from being around another dog with parvo) or indirectly through exposure to infected soil and fomites. Fomites are contaminated things capable of causing diseases such as shoes, tires, brooms, mops, etc.

© 2015 Adrienne Farricelli


Dyson on August 27, 2020:

I had a puppythat died from parvo what is the likelyness that my other dog will get it. He is fully vaccinated.

Leticia Muñoz sepulveda on November 22, 2019:

When is too late for my dog after get parvo?

Adrienne Farricelli (author) on October 26, 2019:

Mary Foy, so sorry for the loss of your puppy. This disease is devastating. It sounds very scary what your vet has reported.

Denise on October 20, 2019:

Our puppy at 12 weeks Parvo so scary I did not know anything about Parvo other than it was not good My coworker friend had a Parvo older dog & she put half water half dawn into butt for only 1st day a coupl times thru out day while putting dawn bleach w/water in it and kills Parvo I tried this hospitalized 1st day then coming home another day just a of slow death of not eating drinking by the 3r day I try the dawn & boiled chicken he got up like nothing ever happed He is healthy happy running playing I’ve saturated our property w/bleach dawn water & get this keeps all other bugs away too water bugs especially Let everyone know ❤️Thank you the article

Mary Foy Ragsdale on October 20, 2019:

Both of our six-month-old black Lab puppies contracted Parvo recently. We took them to North Carolina State University Veterinary Hospital. One puppy survived; one did not. Four days from his exhibition of symptoms and having been in ICU, he was gone. An autopsy was done, and the senior vet professor said he had never seen a worse case. The insides of our dog that did not survive were in a word, decimated. He did not have a chance at all, even with every treatment, procedure and medication possible having been tried. That's how fast this virus can destroy an animal.

Gregoryona Holmes on September 22, 2019:

Can I bring my puppy back into the home that parvo was in

Janice Robinson on June 10, 2018:

How long after bleaching my yard for parvo can my dogs go out been doing it for a week

Pilar on May 12, 2018:

I had a dog with parvo previously like 2 weeks I go. I got a new puppy do you think it will get it?

Adrienne L on March 01, 2018:

I have a almost two year (June 1 ) pit bill female that develop parvo last summer. With your help I was able to save her but not her younger sister from a different litter but same parents. But now my husband wants to breed her when she comes in heat. I said "hell no!" I'm scared she will pass the virus to them. What should I do?

Adrienne Farricelli (author) on January 25, 2018:

Nic. wouldn't it be double devastating getting another puppy and losing it too to this devastating disease? on November 08, 2017:

If a parvo surviver comes in conact with a puppy or the puppy comes in coneact with a carrier's feces will the puppy get parvo? The carrier's had parvo in parvo before was in 2013 and 2009.

Kievitshannon321 on May 13, 2017:

Can humans get Provo?

Dawn McGregor on May 05, 2017:

Why do my puppies die of Parvo Virus only weeks after having their first vaccination? This makes me think that the vaccine actually gives them the virus and they don't develop immunity.

B Y on April 03, 2017:

My 9 week old English bulldog has parvo, he is home after spending a night at an ER clinic, he is weak and we are giving him antibiotics and lots of fluids. My question is, is he safe by going outside to pee and poop? He wont' go inside the house...we have two adult German shepherds and a smaller adult dog but they all are vaccinated and we clean and disinfect the yard with bleach. Also should I throw away my rungs from my house? we sprayed bleach but not sure that it is enough... Thanks!

Adrienne Farricelli (author) on April 02, 2017:

Your GSD puppy really needs to see the vet. If he will be able to survive depends on what is causing the problems you are seeing, which only your vet can determine and give you a prognosis. Don't wait, pups get dehydrated quickly and lethargy is never a good sign in a pup so young!

LAKSHAY SINGH BHATI on April 02, 2017:

I HV a gsd..We got him when he was 45 days old..On d 46th day he started loose motion..But no blood..We got him dewormed..But d next day he had repeated vomitings...Now today is his 4-5th day of treatment...He had blood in his stool till last night but now it is more. Of like brownish watery..Though it is not fully brown or yellow...He hasn't vomited since last 2 days...I am worried..His stomach has shrunk a lot..He is drinking water now but refuses to eat...Will he be able to survive?....Also he is able to move but not fully active..Plz help me..

grant on November 10, 2016:

my dog is hospitalized right now with parvo, I'm hoping for a quick and successful recovery. i do have to say its very expensive to treat but I'm doing what i can for my boy

Adrienne Farricelli (author) on October 10, 2016:

According to the American Veterinary Medical Association "parvo can survive in the environment for long periods of time, greater than or equal to 1 year in soil," therefore, 2 years should be OK, BUT, parvo can be caught in so many other ways, think fomites like tires, shoes etc. that there is never a guarantee a puppy will not get it. All one can do is to practice great caution and make sure the breeder started vaccinations and to continue those booster shots paying close attention not to frequent areas that are at risk.

Nicole on October 10, 2016:

I fostered puppy's 2 years ago and both pups had Parvo. I haven't fostered since because I was afraid of another puppy being contaminated by the virus. Do you that it would be safe to begin fostering again where we can bring in a 8 week old puppy into our house?

Kathleen Kirsan on April 21, 2016:

Wonderful, informative article...thank you for the careful research and for sharing it

Adrienne Farricelli (author) on September 30, 2015:

That must have been so devastating Brakel2. Let's hope one day a better cure is found for this terrible disease and that easier methods are found to kill this hardy virus.

Audrey Selig from Oklahoma City, Oklahoma on September 30, 2015:

Hi Alex - When my kids were little, we had a Golden Retriever puppy that died of Parvo. It was the first dog I ever had, and my kids and rest of family were heartbroken. This article is filled with good information about the virus, and your writing skills rise and shine. I remember scrubbing the cement with bleach and water on my hands and knees, even though we had no other dogs. Someone told me to scrub. Thanks for sharing this hub. Pinning, Blessings, Audrey

Adrienne Farricelli (author) on July 02, 2015:

Happy to hear about such a happy outcome and that your dog got to live 9 years after parvo! No carpet is a big plus!

stella vadakin from 3460NW 50 St Bell, Fl32619 on July 02, 2015:

I got a pup that had parvo and uses the bleach treatment to clean down the house. I was lucky because it was a new house and we had no carpet to worry about. The pup did survive, and lived a wonderful life of 9 years. A really useful hub. Stella

Adrienne Farricelli (author) on May 13, 2015:

Yes, the parvo vaccine is one of those "core vaccines" that are highly recommended by vets. Giving the puppy shots is a no-brainer, because it's so deadly. Yes, definitively, unvaccinated pups shouldn't go to the dog park at least until they have completed the series and the vet gives the green light.

Peggy Woods from Houston, Texas on May 13, 2015:

Thank heavens there are vaccinations to help prevent parvo from developing since it is just about everywhere from what you just wrote. People taking dogs to dog parks might have second thoughts after reading this. Will share this hub and pin to my dogs board.

Adrienne Farricelli (author) on May 02, 2015:

I am happy to hear your pup made it and is now is 13! Those survival rates for parvo are quite scary! Thank you for the votes up. Best regards,


Diana L Pierce from Potter County, Pa. on May 02, 2015:

I had a five month old Jack Russell mix puppy get Parvo. At the time I had no idea how important it was to get those puppy shots. It was a hard lesson learned. Thanks to our local animal hospital, my dog just turned 13 in April. Your research uncovered stuff I was totally unaware of. I really thought cold zero weather would kill any diseases contained in our yards. This is good information. Voted up.

Adrienne Farricelli (author) on May 01, 2015:

Thanks Alicia C!

Linda Crampton from British Columbia, Canada on May 01, 2015:

This is very useful and important information for both dog owners and prospective dog owners. Thanks for sharing it!

Kristen Howe from Northeast Ohio on May 01, 2015:

Oh wow! Big dog for sure!

Adrienne Farricelli (author) on April 30, 2015:

Oh yes, it was when he was a puppy, he's now 85 pounds and full of vigor!

Kristen Howe from Northeast Ohio on April 30, 2015:

I hope you're right, Alexa. My pleasure. Poor puppy! I hope your dog is doing well.

Adrienne Farricelli (author) on April 30, 2015:

Thank you Kristen, I hope it turns out helpful. When my Rottie was a puppy, the vet suspected he had parvo and it was one of the most scary things ever!

Kristen Howe from Northeast Ohio on April 30, 2015:

This was a well-researched and well-written hub, Alexa, on the parvo virus. This was super useful for new puppy owners and what to look out for. Voted up for useful!