Your pet may not have had an adequate number of immunizations to actually boost its immune response.
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Puppies need a puppyhood immunization regiment starting about 6 weeks and receives core vaccines for that area's risks every 2–3 weeks following until the pet is 16–20 weeks old (body size, health, and any other conditions may alter this schedule).
Why do vaccines fail to produce immunity?
A. Sometimes your pet may fail to mount an immune response to the vaccines or your pet may be slightly immunocompromised, immunodeficient or otherwise unable to mount an adequate response.
Therefore, In those conditions, vaccines cannot produce immunity in the body.
B. Your pet may have been immunized with the wrong product by a breeder who bought it over the counter.
C. Your pet may have received a vaccine at a time in the pet had a fever or underlying disease.
D. Wrong method-
a product that was used may have mixed together the dry material with its solvent for too long and been ineffective.
It may have gotten too hot, been frozen, shaken too vigorously.
E. vaccine may have been administered improperly, it may have not actually received the vaccine.
the vaccine may have passed its use-by date (on vaccines, it's important to be used before it expires)
Those are all user error issues and are frequent problems we encounter with animals that are "at home vaccinated" with a commercially available OTC product.
F. Breed Predisposition-
In recent studies, it has been seen, certain breeds are predisposed to parvo. Rottweiler puppies are seen to get parvo despite proper vaccination.
Diseases mimicking Parvo infection
Your pet may not actually have parvovirus, it may have whipworms, roundworms, tapeworms, hookworms, coccidia, Giardia, other colitis. In these conditions too, there is hemorrhagic diarrhea.
Sometimes your dog is exposed to the parvovirus before it ever got its vaccine. It all depends on the incubation period, time and number of vaccines received the status of the dog and actual diagnosis.Parvovirus is the number one killer of puppies and young dogs. If you have not taken your dog to the veterinarian as of yet, I highly recommend you do so as quickly as possible.
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https://www.vetpetz.com/vet-news/outbreak-of-deadly-parvovirus-in-darlington-bishop-auckland-and-redcar/