Summer Brings Increased Risk of Canine Distemper Virus in Dogs

CDV is highly contagious and can affect the respiratory, gastrointestinal, and immune systems of dogs, as well as cause neurological problems. The virus can also infect other species, including ferrets, raccoons, and mountain lions. TVMDL veterinarian Cathy Campbell, DVM, emphasized that the disease can evolve rapidly from mild respiratory signs to severe pneumonia and other complications. Unfortunately, more than 50% of infected dogs do not survive, and survivors may face long-term neurological issues.

The disease spreads mainly through airborne droplets from respiratory secretions, making it particularly difficult to control in environments such as kennels, where dogs can shed the virus before showing symptoms. Campbell noted that adult dogs can also contract the virus, thus regular booster vaccinations every one to three years are recommended, even after the initial puppy vaccination series. Puppies under four months old are particularly susceptible as their immune systems are still developing.

Recognizing early clinical signs is vital for pet owners, as symptoms can resemble those of other illnesses. Initial indicators include fever, lethargy, decreased appetite, coughing, sneezing, clear to thick nasal discharge, and difficulty breathing. As the illness progresses, more severe neurological symptoms can arise, including muscle twitching, head tilt, tremors, seizures, and paralysis. Given these overlapping symptoms, Campbell urges owners to seek diagnostic testing rather than delaying intervention.

Preventive measures include ensuring that puppies receive a full series of vaccinations starting at 6 to 8 weeks, along with boosters as recommended. While no vaccine offers a 100% guarantee, they are effective in managing the disease and safeguarding most dogs. Additionally, pet owners should avoid exposing unvaccinated puppies to high-risk environments, verify vaccination policies at boarding facilities, limit contact with unknown animals, and consult a veterinarian before socializing or traveling.

Diagnostic tests at TVMDL can help veterinarians confirm the presence of CDV and differentiate it from other illnesses. Options include PCR testing for viral genetic material, antibody testing, and respiratory disease panels using swabs or tissue samples. A precise diagnosis is crucial, as symptoms alone do not definitively indicate distemper.

As dogs are commonly adopted during the summer months, new pet owners should remain vigilant against CDV. By following veterinary advice on vaccination and exposure, they can foster a healthy environment for their new canine companions.