Canine Distemper: Symptoms, Treatment and Why Vaccination is Critical
Canine distemper virus (CDV) is one of the most serious infectious diseases in dogs. Before effective vaccines existed, it was the leading killer of dogs worldwide. Even today, unvaccinated dogs — especially puppies — face devastating illness, and survivors frequently suffer permanent neurological damage.
How Does It Spread?
Distemper spreads primarily through respiratory droplets, but also via urine and other secretions. Crucially, it also infects wildlife — foxes, wolves, raccoons, ferrets — so regional outbreaks in wild populations directly increase risk for domestic dogs, even those with limited contact with other dogs.
Three Phases of Disease
- Respiratory phase: fever, nasal and ocular discharge, coughing, lethargy, anorexia
- Gastrointestinal phase: vomiting, diarrhoea, dehydration
- Neurological phase (in a significant proportion of cases, sometimes delayed by weeks): muscle twitching, seizures, ataxia, partial paralysis, jaw-chomping movements, personality changes
A hallmark sign: hardening of the footpads and nose ("hard pad disease") — characteristic of distemper and easily mistaken for other conditions.
Diagnosis
PCR testing from nasal/conjunctival swabs or urine. Conjunctival cells may show characteristic inclusion bodies. Neurological distemper can be difficult to distinguish from other encephalitides — a neurologist's involvement is often warranted in complicated cases.
Treatment
No specific antiviral exists. Treatment is supportive:
- IV fluids and nutritional support
- Antibiotics against secondary bacterial infections
- Anticonvulsants for seizures
- Strict quarantine
Prognosis depends heavily on neurological involvement. Mild cases may recover fully. Severe neurological distemper carries a poor prognosis — many dogs are euthanised to end suffering.
Prevention: Core Vaccination
The DHPP combination vaccine (Distemper, Hepatitis, Parvovirus, Parainfluenza) is a core vaccine — every dog should have it. Puppy series at 8, 12, and 16 weeks; booster at 1 year; then every 1–3 years depending on vaccine type.
Track your dog's vaccination history and upcoming boosters in Purzi. Distemper is too serious to let a booster lapse by accident.