Deadly dog virus outbreak in Ontario leaves puppies dying as vets race to stop the spread

A recent outbreak of canine parvovirus (CPV) in Ontario is raising concerns among dog owners and veterinarians across Canada, with experts urging immediate vaccination as the most effective defense.

CPV is a highly contagious and potentially deadly virus that primarily affects unvaccinated puppies and young dogs. The virus spreads through contact with infected feces, contaminated surfaces, or the fur and feet of infected animals.

“This is a disease we see every year, but outbreaks like the one in London, Ontario, are especially concerning,” said Dr. Tracy Fisher, a veterinarian in Regina and president-elect of the Canadian Veterinary Medical Association. “It’s preventable, and yet we still see tragic cases.”

Symptoms

Symptoms of the virus include severe vomiting and diarrhea, often with blood and a strong odor, fever, lethargy, and loss of appetite. CPV attacks a dog’s white blood cells and can damage the intestinal lining, making it difficult for young or unvaccinated animals to recover without intensive care.

Fisher told CTVNews that without hospitalization and proper treatment, survival rates in very young puppies can be as low as 20 to 30 percent. However, with timely and intensive supportive care, including IV fluids and antibiotics, survival rates can exceed 80 percent.

Mobile clinic

In late June, veterinarians in London launched a mobile clinic in a housing complex to provide low-cost vaccines and testing. The Windsor area saw 14 dogs die during a December outbreak, while last fall, a Winnipeg dog rescue warned of a possible outbreak in Manitoba.

Some breeds, including Rottweilers, Dobermans, Labrador retrievers, and American Staffordshire terriers, are more susceptible to severe illness, according to VCA Canada, a national network of animal hospitals.

No direct treatment

While Canada currently has no approved direct treatment for parvo, a new monoclonal antibody therapy recently received conditional approval in the US. The treatment, developed by Elanco, provides passive immunity and has shown promising survival results in infected puppies.

“We’re excited about the promise of this,” Fisher said. “Parvo is such a miserable disease. This new treatment gives us hope, especially for puppies.”

Still, Fisher emphasized that prevention remains the best strategy.

“Vaccinate on time, especially for puppies,” she said. “It’s the most effective way to protect your dog.”