Canine Distemper: Signs and Lab Tests Explained

Canine distemper is a serious virus of dogs that can harm the eyes, nose, lungs, gut and nerves, and it often starts with fever, runny eyes and cough. Rapid tests, ELISA and PCR can help detect it, but no single test is right at every stage, so your registered veterinarian reads the results with your dog's signs and history.

What is canine distemper?

Distemper is caused by the canine distemper virus. Dogs of any age can be infected, but puppies and unvaccinated dogs are at the highest risk. The virus spreads mainly through tiny droplets in the air when a dog coughs or sneezes. It also spreads by contact with the eye, nose and mouth fluids of an infected dog. It is not known to infect people.

Dogs that mix with many other dogs, for example in shelters, boarding kennels or busy streets, are exposed more often. Because the virus attacks several parts of the body, the signs differ from dog to dog.

Signs of distemper

Not every dog shows every sign. Early signs can look like a cold or kennel cough, which is why a vet check matters. Signs can also come and go, so a dog that seems better may still be ill.

• Eyes and nose: red, watery eyes that turn thick and sticky, and a runny nose.
• General: fever, tiredness and loss of appetite.
• Chest: cough, and fast or difficult breathing.
• Stomach: vomiting and diarrhoea.
• Nerves: muscle twitching, a head tilt, walking in circles, weakness or fits (seizures). These signs can appear weeks after the first illness.
• Skin and feet: a hard, thick nose and footpads in some dogs.

Lab tests for distemper

Your vet may choose one or more of these tests. None is perfect at every stage of the illness.

• Canine Distemper Virus (Rapid Test) is a quick kit test that gives a first answer. A negative result does not rule distemper out, because rapid tests can miss the virus at some stages.
• Canine Distemper ELISA Test is a laboratory test done on serum or plasma, which is the liquid part of blood. Depending on the kit, it may look for the dog's antibodies, which are proteins the body makes to fight germs. An antibody result can come from vaccination or past exposure, so it has to be read with the dog's signs and history. A combined Canine Distemper / Parvo ELISA Test (Combo) is also available.
• Canine Distemper RT-PCR looks for the genetic material (RNA) of the virus in blood and urine. It is more sensitive than a rapid test, which means it is more likely to find the virus when it is present. A negative result late in the illness does not always rule distemper out.
• A Complete Blood Count (CBC) may show white cell changes that fit a viral infection, but it cannot confirm distemper.

The rapid test uses serum, and PCR uses whole blood and urine. For ELISA and PCR, the reporting time is confirmed when you book. Your vet may also suggest chest X-rays or other checks.

Why timing and vaccine history matter

Tests can read differently at different stages of the illness. A dog tested very early may have a negative result and need a repeat test later. A dog that was vaccinated recently may show antibodies, or even vaccine virus, which can confuse the picture. Always tell your vet the dates of your dog's vaccines.

Other illnesses, such as kennel cough, parvo and other infections, can look similar at first. Nerve signs and strange behaviour can also be caused by other serious diseases, including rabies, which can spread to people. Do not touch the saliva of a dog that is behaving strangely, and get a vet to see the dog at once.

Care and protection

Distemper can be life-threatening, and there is no quick fix. Your vet will decide on treatment and supportive care. Early veterinary care gives a dog a better chance, so do not wait, and do not try home remedies.

Keep a sick dog away from other dogs. Vaccination is the main way to protect dogs from distemper. A puppy is not fully protected until it has finished the vaccine course your vet advises. Keep young puppies away from sick or unvaccinated dogs until your vet says it is safe.

When to talk to your vet

See a vet the same day if your dog or puppy has:

• fever with runny eyes or nose
• a cough that is getting worse
• vomiting or diarrhoea along with these signs
• much less appetite than usual

Go at once if your dog has fits, twitching, trouble breathing or sudden weakness. Tell your vet when the signs began, which vaccines your dog has had and when, and whether your dog has met other sick dogs.

Pashupatinath Vet Lab provides free sample collection anywhere in Bhopal. Call or WhatsApp +91 88175 01118 to arrange it. From other towns, samples can be sent to the lab by courier, bus parcel or through your local veterinarian. You can browse all lab tests for Dog on this website.