There aren't a lot of fans of Lyme Disease Vaccine on this board, but I have continued it for my two because my friend's dog died fairly young after suffering from chronic Lyme for some time and because mine have not showed symptoms within what I would guess (and I mean guess) is a reasonable window to associate with the vax.
Lisa T II had a dog who had very adverse issues from Lyme vaccine and I don't discount her experience at all. But Lyme is so bad here in MN and deer ticks are out of control. Even before this mild winter.
Pofi did, a few years ago, seem to have some joint issue in one leg, but x-rays did not show inflamation in a way that would indicate arthritis or Lyme. However, a Western Blot test showed antibodies from the Lyme vaccine and also exposure to Lyme. We treated with Doxy for 4 weeks and he's had no recurrence.
I know there is a chance the vaccine could have adverse effect. But I know with certainty Lyme disease will also and the chances of exposure are profoundly high here. So this is the choice I've made.
Not advice, really, just explaining my approach and decision. I'm also trying my dogs on Certifect this year as I was unhappy with Frontline performance last year. I. Hate. Ticks.