Parvo in Dogs: Signs and Prevention

Parvo is one of the most feared infectious diseases in dogs, especially in puppies that are not fully vaccinated. It progresses very quickly, and a dog can become critically ill within a few days without prompt treatment. The good news is that parvo can be prevented with vaccination and proper hygiene.

What is parvo?

The disease is caused by canine parvovirus. The virus attacks rapidly dividing cells, mainly the lining of the intestine and cells in the bone marrow. The result is severe intestinal damage, causing vomiting, diarrhea and dehydration, along with a sharp drop in immunity that leaves the dog open to further bacterial infection.

How it spreads

• Through the feces of infected dogs: sick dogs shed huge amounts of virus in their stool.
• Through the environment: the virus is very hardy and can survive for a long time on soil, floors, food bowls, leashes and kennels.
• Through people and objects: shoes, clothing and hands can carry the virus from one place to another.

Dogs at highest risk

• Puppies from around 6 weeks to 6 months old, especially if not fully vaccinated.
• Unvaccinated dogs or dogs with an unknown vaccination history.
• Dogs living in crowded places or with poor hygiene.
• Dogs with worms, under stress or that have just moved to a new home.

Canine parvovirus does not infect people. However, people can unknowingly carry the virus on their shoes and clothes.

Signs of parvo

Signs usually appear a few days after infection:

• Lethargy, weakness and loss of appetite, which are often the first signs.
• Fever, or in severe stages, a body temperature that drops too low.
• Repeated vomiting.
• Diarrhea, often with a very strong, foul smell, and possibly with blood.
• Abdominal pain or a bloated belly.
• Rapid dehydration: dry gums, sunken eyes, skin that is slow to return when gently lifted.

Not every dog shows all of these signs. Any puppy that is not fully vaccinated and has vomiting or diarrhea along with loss of appetite needs a vet right away; don't wait to see whether blood appears.

Treating parvo

There is currently no drug that directly kills parvovirus. Treatment is mainly supportive, helping the dog survive the dangerous phase while its body builds immunity against the virus. Veterinarians usually need to:

• Replace fluids and electrolytes, often with an IV drip.
• Control vomiting, relieve pain and prevent secondary infections.
• Monitor closely and provide nutritional support.

Dogs treated early and intensively have a much better chance of survival than dogs brought in late. Don't try to give fluids, medicines or home remedies yourself, as this wastes precious time. Use any medication only as directed by your veterinarian.

How to prevent parvo

1. Vaccinate fully: puppies usually start vaccinations at around 6–8 weeks old, with boosters until around 16 weeks or older, following common recommendations. Your veterinarian decides the exact schedule. Don't stop the series halfway. You can also read our article on puppy vaccination schedules on this blog.
2. Be careful before vaccinations are complete: don't put your puppy down in public places, shared lawns or sidewalks; only let it play with healthy, fully vaccinated dogs.
3. Clean your shoes and hands after handling unfamiliar dogs or coming home from places with many dogs.
4. Pick up feces promptly and keep your dog's area clean.
5. Deworm regularly as directed by your veterinarian to keep your dog healthier.
6. Keep new dogs separate from your existing dogs for a while, until you are sure they are healthy and vaccinated.

If your home has had a dog with parvo

The virus can persist in the environment for a long time, and many ordinary cleaners don't kill it. Ask your veterinarian about a suitable disinfectant, how to dilute it according to the label and how to clean floors, kennels, bowls and toys. Fabric items and toys that are hard to clean are best thrown away. Ask your veterinarian how long to wait before bringing an unvaccinated puppy home.

When to see a vet

Take your dog to a vet immediately, without waiting until the next day, if:

• A puppy or a dog that is not fully vaccinated has vomiting or diarrhea, especially bloody diarrhea.
• Your dog suddenly becomes lethargic and stops eating, with a fever or a cold body.
• Your dog shows signs of dehydration: dry gums, sunken eyes or refusing to drink.
• Your dog has been in contact with a dog suspected of having parvo and starts to seem tired or eat less.

When you call the veterinary practice, tell them you suspect parvo so they can prepare an isolation area and avoid infecting other dogs in the waiting room.