The vaccines in catalogs are the same ones vets order.  There are no
differences.  You must be careful when ordering though for several other
reasons:
 
1.  Vaccines must be refrigerated.  When mailed, they have cool packs which
do not last longer than a day.  Order vaccines when the weather is cool or
at the first of hte week with next day air so they don't sit in a hot truck
all weekend.  Also, try to order vaccines from the company located closest
to you.
 
2.  Rabies vaccines can be ordered by the "public" in only a few states.
Most places will not ship rabies vaccines unless you are a vet or work for
one.
 
3.  Many other states require a license to order vaccines or syringes.  Know
your state laws or read the fine print in catalogs for details.
[Posted in FML issue 1642]