Hey, let's talk about the dog flu vaccine. Jazz actually was given it in the shelter when she was a pup.

My impression is that this vaccine is the same each year. Does anyone know for sure?

Being a vaccine for a viral disease, it should give prolonged protection for the actual strain that it covers, so why do they require it annually? Mind you, it's not a vaccine I would ever give my dogs, though I understand why a shelter might give it.
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MaxaL (aka LisaT)

Jazmine, mini-mix, 10/18/2011
Max-n-Indy
Max, 5/2001-2/2012, RIP my partner, my Regal Boy
Indy, 5/1997-10/2010, RIP my friend, my teacher

Health Index
K9 TBD info and Tick List Links
http://www.rabieschallengefund.org/