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Canine Distemper

For many years canine distemper was one of the most deadly viral diseases affecting dogs. Since the introduction of a vaccine to combat the disease, the incidence of distemper infections has dropped considerably.

Good vaccination practices in the U.S. have played a major role in the reduction of distemper cases in this country, but unfortunately, canine distemper is still a huge problem in other parts of the world.

The canine distemper virus is an RNA virus. A variation of the canine distemper virus causes measles in humans.

Canine distemper can affect dogs of any age but is more likely to affect younger puppies rather than older dogs. This may be due to an acquired immunity resulting from a canine distemper vaccination, or to exposure to the virus, resulting in the dog developing an immunity to the virus.

The wide range of clinical signs accompanying an infection of distemper often makes it very difficult to diagnose a young dog with distemper. In some dogs, a temporary fever and a lack of appetite, sudden lethargy or mild depression, are often the only signs of the onset of distemper. Some dogs infected with the distemper virus may have discharges from the nose and eyes in addition to coughing, a fever, lack of an appetite, vomiting and diarrhea. It is not uncommon for an infected dog to display some but not all of the symptoms associated with canine distemper.

Distemper infections often go undiagnosed when an owner believes the dog just has a cold or some other non-life threatening illness. The unfortunate consequence of misdiagnosing a dog’s distemper symptoms could result in the death of the dog.

Some dogs are able to survive the initial viral infection but later develop neurologic signs in one to two weeks after becoming infected. These signs include seizures, sudden and strange changes in behavior, and constantly walking in circles. Many dogs who develop neurologic signs develop rhythmic motions or twitches. Sometimes an affected dog will act as if it’s chewing on something due to continuous contractions of the head muscles. If a dog is able to survive the initial viral infection and does not display any neurologic damage, it does not mean the dog is completely in the clear. A distemper infection can also lead to retinal damage and discoloration of the dog’s cornea. Sometimes, the dog’s skin, nose and foot pads will become very hard.

There is a period of time that the virus remains dormant after a dog is infected. The clinical signs of distemper will begin to show approximately 10 to 14 days after infection. If a puppy is vaccinated against distemper but has already been infected with the virus, the vaccination will not be effective in preventing the disease.

Currently there is no specialized treatment that can kill the distemper virus. Prevention of infection is the best way to guard your puppy or dog against canine distemper. Be sure your new puppy is vaccinated at approximately 6 weeks of age. The vaccinations will need to be continued until the puppy reaches 12 to 16 weeks of age. The distemper vaccinations are given in 3 to 4 week intervals. Injection of the vaccine has to be repeated due to interference with the vaccine from antibodies in the mother’s milk being passed on to the puppies. These antibodies prevent the vaccine from being effective in about 75% of all puppies vaccinated at six weeks of age, approximately 25% of puppies vaccinated at nine weeks of age, and only a small number of puppies vaccinated at twelve weeks of age.

The follow-up vaccinations provide protection to almost all puppies who receive the vaccine.

Canine distemper virus is found in all the body secretions from an infected animal. Raccoons and skunks are often carriers of this deadly disease, so it’s a good idea to watch your dog carefully when venturing into areas where these animals are often found. Living in the city does not automatically exclude the possibility of an infected raccoon or skunk because these animals love to raid neighborhood garbage cans when foraging for food.

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