For every animal. For a shared future.A nonprofit initiative
PanduanHewanKENALI · PEDULI · LINDUNGI
IDNeed help?

DOG HEALTH

Canine parvovirus: signs, spread and prevention

Canine parvovirus (parvo) is a highly contagious, often fatal viral disease of dogs, especially puppies. A full vaccination course is the main protection.

PanduanHewan editorial teamUpdated Editorial standards
About this guideCompiled from the listed veterinary and health organisations’ guidance; not yet reviewed by a veterinarian.
General information for owners, not a substitute for examination, diagnosis or treatment by a veterinarian. If your animal seems very unwell, in pain, struggling to breathe or may have been poisoned, contact a vet immediately.

Quick answer

Key points

  • Parvo damages the gut lining and bone marrow, causing vomiting, bloody diarrhoea and a weakened immune system.
  • Puppies aged 6 weeks to 6 months and dogs with incomplete vaccinations are most at risk.
  • The virus spreads in dog faeces and can be carried on soil, shoes, hands, bowls and leads.
  • Parvo is nearly always fatal without treatment, so a dog with signs must see a vet straight away.
  • Canine parvovirus does not infect people, but the CPV-2c strain can infect cats not vaccinated against panleukopenia.

When should you see a vet?

  • Contact a vet immediately if a puppy, or a dog whose vaccinations are incomplete, is vomiting, has diarrhoea or is very lethargic; tell the clinic you suspect parvo.
  • Watery, foul-smelling or bloody diarrhoea.
  • Repeated vomiting or refusing food.
  • Pale gums, a painful belly, or a body temperature that is very high or very low.
  • A newly bought or adopted puppy that becomes dull within the first few days.
  • A dog recovering from parvo that starts vomiting again, stops eating or seems lethargic.

Contact your nearest veterinarian or animal clinic. This site cannot assess your animal’s condition. Choosing a vet

In this guide (11)

What is parvo in dogs?

Parvo is a disease caused by canine parvovirus type 2 (CPV), a highly contagious virus that can cause severe illness and death in dogs. The virus damages the gut lining, causing severe vomiting and diarrhoea. It also attacks the bone marrow cells that make white blood cells, which weakens the immune system. In very young puppies, the virus can also attack the heart muscle. Parvo appeared in dogs in the late 1970s and quickly spread worldwide. The virus is closely related to feline panleukopenia virus. Canine parvovirus does not infect people.

Parvo is also found in Indonesia. A Universitas Udayana study recorded parvo in 3.26% of dogs in private veterinary practice records in Denpasar between 2004 and 2007. Another study reports that Kintamani puppies sold at the Denpasar animal market often die of parvo. Around the year 2000 a newer strain, CPV-2c, appeared that can pass from dogs to cats. Cats vaccinated against panleukopenia are protected against it. If you keep both dogs and cats, make sure both get their core vaccines on the schedule your vet recommends.

Evidence: Cornell University College of Veterinary Medicine (Baker Institute) — Canine Parvovirus ↗ · PDSA — Parvovirus in dogs ↗ · Jurnal Veteriner (Universitas Udayana) — Prevalensi dan Faktor Risiko Penyakit Virus Parvo pada Anjing di Denpasar ↗ · Jurnal Veteriner (Universitas Udayana) — Infeksi Alami Canine Parvovirus pada Anjing Kintamani di Desa Sukawana, Bangli, Bali ↗

What are the signs of parvo in dogs?

Signs of parvo usually appear 3–7 days after infection: severe lethargy, loss of appetite, vomiting and watery, foul-smelling diarrhoea that is often bloody. Body temperature may be very high or, instead, very low. The gums may look pale and the belly may be painful. Vomiting and diarrhoea make the dog lose fluid quickly. In severe cases, bacteria from the damaged gut can enter the bloodstream and cause shock. Bloody diarrhoea and vomiting can also have other causes, so only a vet can confirm parvo, for example with a quick test on a faecal sample.

Evidence: PDSA — Parvovirus in dogs ↗ · Cornell University College of Veterinary Medicine (Baker Institute) — Canine Parvovirus ↗ · Cornell University College of Veterinary Medicine — What every dog owner needs to know about parvovirus ↗

How does parvo spread?

Parvo spreads through the faeces of infected dogs, either by direct contact or through contaminated objects and places. Dogs start shedding the virus a few days after infection, often before signs appear, and keep shedding it for several weeks after they recover. The virus can be carried on soil, shoe soles, leads and collars, bowls, clothing, toys and even human hands. Indoors, it survives for at least two months. Outdoors, when protected from sunlight and drying out, it can last for many months and possibly years. This is why puppies that have never met another dog can still be infected.

Evidence: Merck Veterinary Manual — Canine Parvovirus Infection (Parvoviral Enteritis in Dogs) ↗ · PDSA — Parvovirus in dogs ↗ · Cornell University College of Veterinary Medicine — What every dog owner needs to know about parvovirus ↗

Which dogs are most at risk of parvo?

Puppies aged 6 weeks to 6 months, and dogs that are unvaccinated or not fully vaccinated, are most at risk of parvo. Antibodies from the mother protect puppies early in life, but their level keeps falling and varies from puppy to puppy. These antibodies can also block vaccines given too early. In Denpasar, a Universitas Udayana study found that dogs with incomplete vaccination were about 10 times more likely to get parvo. Puppies aged 0–3 months were about 3 times more likely to be affected than older dogs. Another Bali study reports that parvo can kill up to 91% of infected puppies, especially unvaccinated ones.

Evidence: Merck Veterinary Manual — Canine Parvovirus Infection (Parvoviral Enteritis in Dogs) ↗ · WSAVA — 2024 Guidelines for the Vaccination of Dogs and Cats ↗ · Jurnal Veteriner (Universitas Udayana) — Prevalensi dan Faktor Risiko Penyakit Virus Parvo pada Anjing di Denpasar ↗ · Jurnal Veteriner (Universitas Udayana) — Infeksi Alami Canine Parvovirus pada Anjing Kintamani di Desa Sukawana, Bangli, Bali ↗

When should puppies be vaccinated against parvo?

Puppies usually receive several parvo vaccinations, starting at around 6–8 weeks of age and repeated every 2–4 weeks, with the last one given at 16 weeks of age or later. The 2024 WSAVA guidelines list the parvo vaccine as a core vaccine for every dog worldwide, alongside the distemper and adenovirus vaccines. WSAVA advises a further dose at 26 weeks of age or later. After that, core vaccines are generally repeated no more often than every three years. No vaccine gives 100% protection, but vaccination is still the best way to prevent parvo and reduce how severe it is.

Until the vaccination course is finished, keep your puppy away from places likely to hold a lot of virus, such as shelters and boarding kennels. In public places, carry your puppy rather than putting it on the ground. Buy or adopt puppies from responsible sources, and check that the puppy looks healthy and lively. The Blitar Regency livestock and fisheries office lists parvovirus among the dog diseases that vaccination prevents, advises owners to visit their nearest vet, and recommends vaccinating only when the dog is healthy.

Evidence: WSAVA — 2024 Guidelines for the Vaccination of Dogs and Cats ↗ · Merck Veterinary Manual — Canine Parvovirus Infection (Parvoviral Enteritis in Dogs) ↗ · PDSA — Parvovirus in dogs ↗ · Cornell University College of Veterinary Medicine (Baker Institute) — Canine Parvovirus ↗ · Dinas Peternakan dan Perikanan Kabupaten Blitar — Pentingnya Vaksinasi pada Hewan Peliharaan ↗

What should you do if you think your dog has parvo?

Contact your vet immediately, say that you suspect parvo, and follow the clinic's instructions so your dog does not infect other animals in the waiting room. The chance of survival is much higher when the dog reaches a vet quickly. There is no medicine that kills the virus. Dogs usually need intensive care, such as intravenous fluids and medicines to control the signs, often in a hospital isolation ward. With appropriate supportive care, about 70–90% of dogs survive. Without treatment, parvo is nearly always fatal. Do not treat your dog at home or wait for the signs to improve.

Evidence: PDSA — Parvovirus in dogs ↗ · Merck Veterinary Manual — Canine Parvovirus Infection (Parvoviral Enteritis in Dogs) ↗ · Cornell University College of Veterinary Medicine — What every dog owner needs to know about parvovirus ↗

How do you clean up after parvo?

First clean away faeces and vomit, then use diluted household bleach or a disinfectant labelled as effective against parvovirus. According to the Merck Veterinary Manual, bleach diluted 1:30 can inactivate the virus. Quaternary ammonium disinfectants are not reliable against parvo. Even so, it is almost impossible to remove all of the virus, especially from gardens and soil. Recovered dogs still shed the virus for 2–4 weeks, so keep them away from other dogs and public places during that time. If you plan to get a new puppy, it is best to wait until it is fully vaccinated before bringing it home, and to ask your vet for advice.

Evidence: Merck Veterinary Manual — Canine Parvovirus Infection (Parvoviral Enteritis in Dogs) ↗ · PDSA — Parvovirus in dogs ↗

Sources & references

  1. Cornell University College of Veterinary Medicine (Baker Institute) — Canine Parvovirus ↗
  2. PDSA — Parvovirus in dogs ↗
  3. Jurnal Veteriner (Universitas Udayana) — Prevalensi dan Faktor Risiko Penyakit Virus Parvo pada Anjing di Denpasar ↗
  4. Jurnal Veteriner (Universitas Udayana) — Infeksi Alami Canine Parvovirus pada Anjing Kintamani di Desa Sukawana, Bangli, Bali ↗
  5. Cornell University College of Veterinary Medicine — What every dog owner needs to know about parvovirus ↗
  6. Merck Veterinary Manual — Canine Parvovirus Infection (Parvoviral Enteritis in Dogs) ↗
  7. WSAVA — 2024 Guidelines for the Vaccination of Dogs and Cats ↗
  8. Dinas Peternakan dan Perikanan Kabupaten Blitar — Pentingnya Vaksinasi pada Hewan Peliharaan ↗

References can change. Check dates and context in the original source.

Cite this page

PanduanHewan. (2026, 25 September). Canine parvovirus: signs, spread and prevention. PanduanHewan.org. https://panduanhewan.org/en/pet-health/canine-parvovirus/