Distemper in Dogs: Symptoms, Forms, Treatment & Prevention

Canine distemper is one of the most serious viral diseases a dog can face — and one of the oldest. First documented in the late 18th century, it’s caused by the paramyxovirus Canine morbillivirus and can be fatal if left untreated.

Also known as Carré’s disease or canine plague, distemper attacks multiple body systems simultaneously. The good news: with early diagnosis and proper treatment, many dogs survive and recover fully.

How do dogs get distemper?

The virus spreads through direct contact with an infected animal or through airborne exposure. Respiratory and digestive tracts are the two main entry points.

Here’s what makes it tricky: you can unknowingly bring the virus home on your shoes. Cats can carry it without getting sick. Wild animals — foxes, wolves, ferrets, raccoons — are natural reservoirs.

The incubation period typically runs 1–3 weeks, though it can stretch to three months. During this window, your dog looks healthy — but is already contagious. The virus is shed through saliva, urine, feces, and nasal discharge.

Worth knowing: the virus is fragile outside a host. It survives a few weeks at room temperature but dies within 30 minutes at 60°C, and instantly at 100°C. Standard disinfectants destroy it easily.

Early signs of distemper in dogs

The initial symptoms are easy to miss — they look a lot like a common cold.

Watch for:

• Loss of appetite and lethargy
• Dry nose
• Red, watery eyes and sensitivity to light
• Hiding in dark places
• Digestive upset
• Unusual anxiety or timidity

Symptoms vary by age, immune status, and overall health. Puppies under one year old and immunocompromised dogs are at highest risk. Hunting breeds face extra exposure through contact with wild animals.

Forms of distemper in dogs

Distemper doesn’t follow one script. Vets recognize five forms, each affecting different systems — and most cases involve a mix of several.

Pneumonic (respiratory) form

The most common presentation. Your dog develops a fever, stops eating, drinks more than usual, and starts coughing and sneezing. Eye and nasal discharge starts clear, then turns purulent. Without treatment, it progresses to pneumonia.

Intestinal form

The dog refuses food, becomes lethargic, and develops vomiting and diarrhea. A white coating appears on the tongue, breath smells foul, and the liver may enlarge. Vomit typically contains mucus, bile, and undigested food.

Nervous form

The most dangerous form. The dog becomes irritable or aggressive, loses coordination, and reacts strangely to sounds and touch. Nighttime howling is a classic sign. As it progresses: seizures, hind leg paralysis, and encephalitis can develop.

The nervous form carries the worst prognosis. Death from cardiac or respiratory muscle paralysis is possible if treatment is delayed.

Cutaneous form

The mildest form — but often the first visible sign of a broader infection. Small pustules appear on the inner thighs, abdomen, ears, and around the eyes and mouth. They burst and form brown crusts. Swelling of the paws, ears, and eyelids is common.

Mixed (generalized) form

The most frequently diagnosed — especially in unvaccinated puppies. It combines symptoms from two or more forms above, making treatment harder and the outcome more unpredictable.

Distemper treatment in dogs

There’s no single drug that kills the distemper virus. Treatment is supportive: it keeps your dog stable while their immune system fights back.

A vet will build a plan around:

• Rehydration and preventing dehydration
• Antiemetics and gut support
• Antibiotics to prevent secondary bacterial infections
• Anticonvulsants for the nervous form
• Liver and kidney support
• Immune-supportive serums (most effective in early stages)

Don’t attempt home treatment. Distemper progresses fast — every hour matters. If your dog shows symptoms, call your vet immediately rather than waiting to see if things improve.

Can a vaccinated dog get distemper?

Vaccination is the most effective protection available, but it’s not a 100% guarantee. If a vaccinated dog does get infected, the disease is typically much milder and easier to treat.

Vaccine failure can happen due to improper storage, vaccinating an already-sick dog, or manufacturing defects. That’s why annual boosters and reputable vaccine sources matter.

The first distemper vaccine is given at 8–10 weeks, with a booster at 12–16 weeks. Annual revaccination is recommended throughout the dog’s life.

Is distemper contagious to humans?

No. Canine distemper does not infect people. You can safely care for your sick dog without any risk to yourself.

Preventing distemper

Vaccination is the cornerstone. Beyond that, a few habits make a real difference:

• Wash your dog’s paws after every walk
• Avoid contact with stray or visibly sick animals
• Maintain a balanced diet and regular vet checkups
• Support immune health through proper nutrition and exercise

A strong immune system doesn’t prevent infection — but it dramatically improves outcomes if infection does occur. Keep up with vaccinations, and don’t skip annual boosters.