Parvovirus in Dogs: Signs, Treatment and Prevention

What it is

Canine parvovirus (CPV) is a hardy virus that causes severe inflammation of the intestines. Dogs catch it by swallowing virus that infected dogs shed in their feces. The virus travels easily on hair, paws, shoes, clothing and objects, so direct contact between dogs is not needed.

Signs usually appear about three to seven days after exposure. Vomiting often comes first, followed by diarrhea that may be bloody, full of mucus and unusually smelly. Dogs also tend to be tired, off their food and feverish. Many infected dogs show mild or no signs, but in a sick puppy the illness can get worse within a day or two.

Unvaccinated dogs under a year old are affected most often, and the youngest puppies are usually the most severely ill. Infected dogs shed virus before they look sick and for up to about two weeks after they recover. VCA reports no evidence that parvovirus spreads to people.

Causes and risk factors

Cause	What it means
Not vaccinated, or vaccine series unfinished	Unvaccinated and incompletely vaccinated dogs are the most susceptible.
Age between 6 weeks and 6 months	Puppies under about 5 months are usually the sickest and hardest to treat.
Contact with infected feces	Dogs catch it by swallowing the virus, often from ground, hands, shoes or objects that carry it.
Places where many dogs mix	Dog parks, pet stores, kennels and shelters raise the odds of exposure.
A virus that lasts in the environment	It can stay infectious for months on contaminated surfaces and survives many disinfectants.
Fading maternal antibodies	Antibodies from the mother protect young puppies at first, then fade, and they can also interfere with early vaccines.
Certain breeds	Merck lists Rottweilers, Doberman Pinschers, English Springer Spaniels, German Shepherd Dogs and pit bull–type dogs as higher risk, and VCA reports higher death rates in some breeds for reasons not fully understood.

What you can do at home

Parvo is not something to manage at home, so call your vet as soon as you see vomiting and diarrhea in a puppy or unvaccinated dog. Ring ahead so staff can bring your dog in without exposing other patients. Do not give anti-diarrhea products or any other medicine unless your vet says to.

Isolate your dog from other dogs while you wait, and keep unvaccinated dogs away from anywhere your dog has been. Cornell advises keeping a recovering dog separate for up to two weeks after recovery.

Cleaning matters because most household cleaners do not kill the virus. Remove all feces and other organic material first, then apply household bleach diluted 1:30 with water (1 part bleach to 30 parts water) and leave it on the surface for at least 10 minutes. Merck notes that quaternary ammonium disinfectants are not considered reliable against parvovirus. Ask your vet about the right approach for bowls and anything your dog chewed.

If you have other dogs, ask your vet whether their vaccines are up to date.

What happens at the vet

Your vet will suspect parvo from your dog's age, vaccine history and signs. A quick fecal test in the clinic can screen for the virus, and a lab can confirm it. Bloodwork often shows a low white blood cell count. Suspected cases are isolated right away.

Treatment is mainly supportive care. The core of it is IV fluids with electrolytes to fix dehydration, plus anti-nausea medicine, medicine to prevent bloodstream infection, and pain relief. Merck notes that early feeding is linked to faster improvement, and severe cases may need plasma. A monoclonal antibody treatment is also available in some places and can ease signs, but it does not repair damage already done.

Hospital care is recommended, although Cornell notes that outpatient care can work when owners can give the medicines and attend daily checks.

The outlook is better than many owners fear. The Merck Veterinary Manual puts survival with appropriate supportive care at 70 to 90 percent, and above 90 percent for dogs treated aggressively in the hospital. VCA adds that puppies who have not improved by day three or four have a poorer outlook. Dogs that recover typically develop long-lasting immunity.

Prevention

Vaccination is the most important step. Puppies usually start their parvovirus vaccine at 6 to 8 weeks and get boosters every few weeks until about 16 weeks or a little later. A booster follows a year later, and adult dogs are then typically boosted about every three years. Your vet sets the exact schedule, and dogs in high-exposure settings may need more frequent boosters.

Until the puppy series is done, avoid places where unvaccinated dogs gather, such as dog parks and pet stores. Ask your vet when it is safe to start socializing, and use the puppy first week checklist to plan the first visits.

Breeding dogs should be vaccinated before breeding. Because the virus lingers in soil and on surfaces, treat any area where an infected dog has had diarrhea as contaminated and keep unvaccinated dogs out of it.

Frequently asked questions

How do dogs catch parvo?

Dogs catch parvo by swallowing the virus, which infected dogs shed in their feces. It can ride on paws, hair, shoes, clothing and objects, so a dog does not need to meet an infected dog to be exposed. Infected dogs shed virus before they look ill. If your dog has diarrhea and is a puppy, call your vet.

How long after exposure do parvo signs start?

VCA says signs usually appear 3 to 7 days after exposure, and the Merck Veterinary Manual gives a range of about 2 to 14 days.

Can adult dogs get parvo?

Yes. Any unvaccinated or incompletely vaccinated dog can catch it, although it is seen most often in puppies and in unvaccinated dogs under a year old. Keeping boosters up to date protects adults.

Can a dog survive parvo?

Many do. Merck reports survival of 70 to 90 percent with appropriate supportive care, and above 90 percent with aggressive hospital treatment. Early treatment matters, because most untreated dogs do not survive.

How do I clean up after parvo?

Remove all feces and organic debris first, then disinfect with household bleach diluted 1:30 with water (1 part bleach to 30 parts water), left on for at least 10 minutes. Most common household cleaners do not kill the virus, so ask your vet if you are unsure about a particular item.

Written from veterinary sources by the Pawsplained editorial team. Not yet reviewed by a veterinarian; this is general information, not a diagnosis or treatment plan. Updated Oct 30, 2026. Editorial policy