We have 2 Boys, my enormous adorable sooky babe Rottweiler "Kuma" & a very cheeky and ****y Bull Mastiff "Major" both are 4 years old and get vaccinated annually...

I think I'd be inclined to take the "Just in Case" path and still get your precious pup vaccinated every year, it's just not worth her possibly getting so ill over an $80 vacc

Very interesting though isn't it?! I'll have to hit my vet up next time I brave Kuma dragging me in there