I have just taken in a stray dog which, of course, I want to have vaccinated against all possible diseases. Will the vet be able to tell if it has already been vaccinated, and will it harm the dog to be vaccinated again?

First of all, a vet would not be able to tell from examining the dog whether or not it has been vaccinated against the usual infectious diseases; unless of course it is showing obvious signs of one of them which would strongly suggest that it has not been recently vaccinated.

It is possible to measure the level of antibody in the blood against a particular organism, although this will not tell you whether it is the result of vaccination or natural infection; not that this matters because the immunity would be the same. However, this type of test is not done routinely and would therefore be expensive and difficult to arrange, particularly since it would need to be done separately for each disease. More importantly, it would be unnecessary to go to this trouble and expense since routine vaccination would be cheaper and would not be harmful even if it was not required.

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