Does vaccination ever cause the disease?

With modern vaccines this is extremely unlikely to occur and could only happen with live vaccines in which the viruses were not as weakened as was believed. Rare cases in which a dog develops the disease shortly after administration of a vaccine are almost always due to the animal having already been in the incubation stage of the disease (i.e. after infection but before signs appear) when vaccination was performed.
Occasionally a dog will show an allergic reaction to a vaccine, which requires treatment with adrenaline.

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