>Also, I thought the vet told us that if it's a first vaccine with a
particular type of medicine, they will not react at all- that it's only
the second time (and maybe subsequent shots) that you will see a reaction.
Is this true?
 
Afraid not - although it's more common to react after a second or more
exposure, it is certainly possible to have a reaction the first time the
animal is exposed to the substance.  I would consider pre-treatment in
this case.
 
Dr. Ruth
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Save lives - spay or neuter your pet
[Posted in FML issue 3567]