Tonya Dixon's puppy Sassy prepares to receive deworming medication at a free dog vaccine clinic to combat a canine Parvovirus outbreak on Monday, Feb. 3, 2025, in the Tenderloin in San Francisco. (AP Photo)
A recent spike in canine parvovirus (CPV) cases in Ontario has put pet owners on high alert. The highly contagious virus has triggered localized outbreaks, with online searches for symptoms, prevention, and treatment surging across Canada.
Though outbreaks vary by year and region, experts say the virus is far from new—or rare
This highly contagious illness is serious, especially for puppies and unvaccinated dogs.
But what exactly is parvo, how does it spread, and what can you do to protect your pup? Here’s what vets want you to know.
What Is Parvo and Why Is It Dangerous?
Parvovirus (or CPV) first showed up in dogs back in 1978. It spreads fast, mostly through contact with infected dog poop. But it can also linger on fur, paws, or even on things like food bowls or leashes.
Once inside a dog’s body, the virus attacks the immune system and digestive tract. It hits young puppies the hardest—and some breeds, like Rottweilers, Dobermans, and Labradors, are especially vulnerable.
The Symptoms Are Hard to Miss
The main signs? Intense vomiting and diarrhea—often with blood and a strong smell. Dogs may also lose their appetite, run a fever, or seem really tired.
“It’s heartbreaking,” says Dr. Tracy Fisher, a vet from Regina and president-elect of the Canadian Veterinary Medical Association. “Without treatment, young puppies have a really low chance of survival—sometimes just 20 to 30 per cent.”
Treatment Exists, But It’s Tough
There’s no official cure in Canada yet. If your dog gets parvo, they’ll likely need to be hospitalized. Treatment includes IV fluids, meds to manage nausea, and antibiotics to prevent infections.
With this kind of care, most dogs do survive—around 80 per cent or more.
In the U.S., a promising new antibody treatment has just been conditionally approved. It could help exposed or infected dogs fight the virus more effectively. It’s not available in Canada yet, but vets are hopeful it could be a game changer down the road.
Ontario’s Latest Outbreaks
This summer, several Ontario communities reported outbreaks, including one in London that led to a pop-up clinic offering low-cost testing and vaccines. In Windsor last year, 14 dogs died during a local surge. Manitoba has also seen recent concerns.
While the outbreaks tend to be localized, they’re a powerful reminder: parvo is still very much a threat.
Your Best Defense? Vaccination
Dr. Fisher’s advice is simple—don’t skip vaccines. Puppies especially need their shots on schedule to stay protected.
“The best treatment is prevention,” she says. “We’ve made big strides with vaccines, but they only work if people use them.”
So if you’re a dog owner in Canada, now’s a good time to double-check those vet records. A quick shot could save your pup’s life.
