The Rabies shot is mandated by your local laws. I'm not sure if it's better to dose your dog up every year with a 1-yr vaccination or if it's better to do the 3-yr, but it is mandated by US law to have one or the other (every 1 or 3 yrs according to the vaccination label).
The first Rabies vaccination (~6 month old puppy) is always a one-year. After that you have the option to use the 1-yr or 3-yr. I actually heard that there is a 4-yr vaccination, too.... Not sure about that one though.
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