Lyme disease: a bacterial disease vectored by ticks that can cause long-term health issues.
It turns out that a vaccine was developed when lyme disease was first discovered to be a serious problem on Cape Cod. AWESOME! FIGHT THOSE TERRIBLE DISEASES!
But anti-vaccine advocates protested that the vaccine caused arthritis (a symptom which was never seen in clinical trials, and there is no evidence linking arthritis to the vaccine) and in the media backlash it was taken off the market.
So although it exists, and your dog can get vaccinated and live a lyme disease free life, we the people cannot. Read all about it here.