@Lilabiene Doesn't sound like overkill to me if you've been dealing with Lymes! You should chat with your vet about how affective Frontline is in your area.  Our dog tested postive for Lymes even though he was on year-round, carefully administered frontline.  After talking with several vets I was told that a lot of people think that Frontline might be loosing it's effectiness, but the industry has not really made it public yet.  We switched to Bravecto a year ago and I have not found a live tick on our dog since, even after he sat down in a tick nest!  I'm not a vet and I think that it's probably regionally specific, so just a thought from a fellow tick hater.