Canine influenza, or canine “flu,” is more than just a cough. It is a highly contagious respiratory virus that can spread quickly among dogs. Unlike many mild respiratory infections, canine influenza can cause serious illness. The virus spreads through the air when dogs cough or sneeze and can also linger on objects like bowls or leashes, infecting dogs even before they show any symptoms.
“Canine influenza can spread rapidly between dogs, especially in shared spaces,” says Dr. Karen O’Connor, Regional Veterinary Medical Director of Pet Paradise + NewDay Veterinary Care. “Even dogs that appear healthy or aren’t showing symptoms can be contagious. Vaccination is one of the best ways to protect your dog from the canine flu.”
More Than Just a Cough
Unlike typical kennel cough, canine flu symptoms can be severe. Dogs may develop fever, coughing, sneezing, nasal or eye discharge, lethargy, loss of appetite, and breathing difficulties. In some cases, the illness progresses to pneumonia, which can escalate to become fatal.
Dogs who spend time around other dogs are at higher risk. If your pet visits boarding facilities, daycare, or the groomer, they may encounter the flu even if they don’t interact directly with other dogs. In fact, the virus can travel over 20 feet every time an infected dog coughs or barks, landing on objects that remain infectious for others.
Vaccination: Your Dog’s Best Defense
Fortunately, dogs can be vaccinated to help their immune system fight the virus. Dr. O'Connor adds, “The vaccine reduces the severity of illness and decreases an infected dog’s ability to transmit the virus to others. While it does not always completely prevent infection, it provides important protection for your dog and for other pets.”
According to the American Animal Hospital Association (AAHA), “Virtually all dogs who have not been exposed to the canine influenza virus become infected when exposed.” AAHA also noted that 80% of dogs who are infected with the canine flu become sick.
The canine influenza vaccine is given initially in two doses, spaced 2 to 4 weeks apart, followed by an annual booster. Adverse reactions are exceptionally rare. If you have questions about the vaccine or your dog’s vaccination schedule, speak with your veterinarian.
It’s important to note that the canine influenza vaccine is different from combination vaccines that protect against parainfluenza or kennel cough. A typical kennel cough vaccine will not protect against canine flu.
Protecting Our Pack
At Pet Paradise, our goal is to protect every guest from preventable illness while keeping pets safe, happy, and healthy. That’s why, beginning on August 1, 2026, we will require all dogs to be fully vaccinated against canine influenza. Staying current on vaccinations helps reduce the risk of illness for your dog and for every pet they encounter.
For more information about why we’re giving our vaccine requirements a tune-up, click here.
