Canine distemper virus is a highly infectious viral disease of dogs which can cause mild
signs in some individuals, but may be fatal in others. Whilst vaccination has resulted in a
decrease in the incidence of this disease in recent years, pockets of infection still exist,
especially in large cities where there are many unvaccinated dogs. In other countries, like
Who is at risk?
Dogs less than one year of age are most commonly affected. However, those animals
How is it spread?
The main source of infection is by inhalation of aerosol droplets during close dog-to-dog
contact. Signs can take up to three weeks to appear. The virus cannot survive easily in
the environment and can be killed by most household disinfectants.
Cause of canine distemper
Canine distemper is a large virus related to the virus causing measles in man. It is a
morbillivirus virus (this group of viruses also includes measles and seal distemper). Some
strains of the virus may be more pathogenic than others. However, vaccination offers
Signs and symptoms
The early signs of disease are primarily respiratory with runny eyes and nose, and
coughing. This is followed by depression, loss of appetite, vomiting and subsequently
diarrhoea. In the later stages of the disease, dogs may develop thickening of the foot
pads, known as ‘hard pad’, and nose. Dogs which survive may go on to show serious
How will the vet know what is wrong?
The vet will probably suspect that your dog might have distemper from the symptoms,
the dog's vaccination history and the findings on physical examination. A blood test will
also show a severe decrease in the white blood cell numbers and possibly the presence of
Prevention and control
It is essential to vaccinate your dog according to your vet's recommendations. Pups that
are born to vaccinated dams usually have antibodies from their mothers (maternal
antibodies) that protect them against infection during the first few weeks of their lives.
The pup is in danger after the level of maternal antibodies declines and that is when it
should be vaccinated.
There is no specific treatment for canine distemper, although supportive therapy in the
form of intravenous fluids are often given to correct the fluid loss due to vomiting and
diarrhoea. The best form of protection against this virus is through vaccination. You’ll be
pleased to know that there are some vaccines that offer a duration of immunity of three
years, this means your dog is protected for a full three years.