**There are now two vaccines available to vets (for dogs) that have been successfully tested, and approved by the USDA, to provide 3-year coverage of the DAP (Distemper/Adenovirus/Parvovirus) viruses.  These vaccines are Intervet Continuum and Fort Dodge Duramune Adult 3 year (not Duramune Max or a 5-in-1 Fort Dodge product.).  These vaccines have been licensed by the USDA because they have been successfully challenged against a 3-year immunity. We will accept ONLY these two vaccines at a 3-year expiration.   You must have your vet provide proof that (s)he uses one of these vaccines either by providing a copy of the vial label or some other document on your vet's letterhead verifying the use of one of these licensed vaccines.  You should know that these vaccines actually contain more "vaccine" in order to cover a dog's immunity for 3 years.  As a result of this, some dogs have shown more sensitivity to these vaccines, meaning some have displayed allergic reactions or other related illnesses after inoculation.  Due to the increase in reactions, many vets do not use these vaccines, rather extend a 3-year expiration date to the typical annual vaccine.  You should be aware that the package inserts for the annual Distemper Combo vaccines state a disclaimer against this policy.  In other words, the manufacturers themselves will not back the product after one year especially for dogs in "high risk" situations which they define as dogs attending a boarding, grooming, or training facility, or dogs attending dog parks or who partake in any group play.**