Canine Flu, also known as dog flu, is a highly contagious respiratory disease affecting dogs across the United States. Caused by specific strains of the influenza virus, it spreads rapidly in places where dogs congregate, such as kennels, dog parks, and grooming facilities. Common symptoms include coughing, sneezing, fever, and reduced appetite. While most dogs recover within a few weeks, some may develop severe complications like pneumonia. Vaccines are available to help protect against canine flu, so it’s advisable for pet owners to consult their veterinarians about preventive measures.
Did you know that your canine companion can get the flu? In fact, there’s an outbreak going on now. Fido’s version, canine influenza virus (CIV)–also often called the dog flu—is an influenza A virus. There are several strains, but the two that are most common in the US are H3N8 and H3N2. These strains are both extremely contagious, and are the culprits behind the current outbreak. A local vet offers some information on this below.
Symptoms
If Fido gets the flu, he’ll likely have many of the same symptoms as you would, such as coughing, nasal discharge, fever, lethargy, and reduced appetite. Of these, coughing is the most common. It may also be the most persistent. That said, our furry friends all react differently to the flu. Some pups will not show any symptoms at all. Other dogs may bounce back after a few days, or stay sick for weeks. A few will become severely ill. In rare cases, dog flu can be fatal. Senior dogs and pooches with chronic illnesses and/or immune deficiencies are at highest risk. If you have an older dog, you might also be interested in our guide on Summer Care for Senior Dogs to help keep your furry friend healthy year-round.
Spread
Fido’s flu can spread extremely quickly. The virus is transmitted through droplets of saliva, and can remain active in respiratory droplets on surfaces for several hours. Pups can easily contract it through shared toys or dishes. Fido could also get sick by greeting or nose-booping another pooch, or even just by sniffing a stick at a park that a sick dog played with hours ago.
Dogs that have contracted the flu remain contagious for about a month. As one can imagine, places like dog parks, daycares, grooming salons, and kennels can quickly become hotspots of contagion. Another potential source of spread? People! Someone who pets an infected dog and then a healthy one may quickly spread the illness from pooch to pooch. Be aware of the risks when taking Fido to different places. You can also track the current outbreak online here.
Treatment
There is currently no cure for dog flu. Most dogs recover naturally, but they may require some additional care and attention. Keep your furry friend comfortable and well-hydrated, and monitor them closely. If you suspect your dog has the flu, consult your vet for tailored advice on managing their symptoms.
Dog Flu: Understanding Symptom Presentation and Recovery Patterns in 2025
What percentage of dogs show symptoms vs. remain asymptomatic?
Approximately 80% of dogs infected with canine influenza virus (CIV) exhibit clinical symptoms such as coughing, sneezing, fever, lethargy, and reduced appetite. The remaining 20% may remain asymptomatic, showing no outward signs of illness, yet they can still shed the virus and infect other dogs. This asymptomatic transmission makes controlling the spread of CIV challenging, as seemingly healthy dogs can contribute to outbreaks. Monitoring your dog’s health and minimizing exposure to high-risk environments can help reduce the risk. Vaccination is also recommended, especially for dogs that frequently interact with other dogs in places like parks, kennels, or grooming facilities.
What is the specific duration of contagion for each strain?
Dogs infected with the canine flu can remain contagious for up to a month. Both H3N8 and H3N2 strains of the virus are highly transmissible and present significant risks in environments where dogs come into close contact, such as parks, kennels, and grooming facilities. Although individual contagion periods can vary slightly, dogs with either strain generally carry the virus in their respiratory droplets, making shared objects or spaces a source of infection for others. Owners should remain vigilant for signs of illness in social settings to prevent further spread.
What is the mortality rate for canine flu?
The mortality rate for canine flu is relatively low; most dogs recover with supportive care. However, severe cases can occur, particularly in senior dogs or those with chronic health conditions or weakened immune systems. In rare instances, canine flu can be fatal. The virus strains H3N8 and H3N2, which are highly contagious, are responsible for recent outbreaks in the United States. Early intervention, hydration, and careful monitoring help reduce the risk of complications, so veterinary consultation is advised if flu symptoms, like coughing or lethargy, appear.
What specific supportive medications might be prescribed?
Supportive medications for canine flu may include cough suppressants to alleviate persistent coughing and discomfort. Antibiotics might be prescribed to prevent or treat secondary bacterial infections that can occur due to the weakened immune system. Anti-inflammatory medications can help reduce fever and inflammation. In severe cases, intravenous fluids may be administered to combat dehydration and support overall health. Nutritional support and ensuring adequate rest are also important for recovery. Bronchodilators may be used to ease breathing difficulties. Probiotics might be recommended to support gut health during antibiotic treatment. It’s essential to consult a veterinarian for appropriate treatment, as they can tailor the medications based on the dog’s specific condition and needs.
What is the typical recovery timeline?
Dogs typically recover from canine flu within two to three weeks, although symptoms may vary. Most dogs experience coughing, nasal discharge, fever, lethargy, and appetite loss, with coughing often persisting for longer. Some dogs recover quickly after a few days, while others may experience symptoms for several weeks. Senior dogs or those with chronic health conditions are at a higher risk for severe illness. Contagion can last up to a month, so isolating affected dogs and providing rest, hydration, and comfort can help promote a smoother recovery.
Do you have questions about your pet’s health or care? We’re here to help!
Contact us, your local animal clinic in Fox Lake, IL! We offer comprehensive vet wellness and pet vaccination services to help protect your furry friend from various health issues, including canine flu. Regular check-ups and vaccinations are key to maintaining your dog’s health and preventing the spread of contagious diseases.