There is not guarantee with the vacc. However it does give some protection form what I understand.
The best thing to do is check your dog everytime they come in from outside. If you find one this is a good way to handle it:
Removal of ticks
If a tick becomes attached, the simplest method of removal is a slow, steady pull that will not break off the mouthparts, thus leaving them in the wound. Application of alcohol, vaseline, gasoline and other substances do not work well - nor does the use of a hot match or other heat source.
The pull should be steady but very slow - usually after 20-30 seconds of a slow pull, the tick will release its bite and separate from the skin. Pulling much quicker than this will usually break off the head, and it will remain in the skin. It is often recommended to remove ticks with a forceps, but pulling with the fingers is more sensitive and less likely to pull the head off. Fingers are always available as well, and early removal of the tick is less likely to result in infection with a tick borne disease. After removal it is important to wash the hands, since tick secretions may be infective. If the head does separate, it is best to have the remaining portion removed by a vet.
If you find it before they are engorged you should be o.k.. They don't secrete the bad stuff until they disengage which is usually after 24 hours.