I have personally never noticed much, if any, affect on Ticks with Frontline or Frontline Plus. Luckily they for some odd reason don't seem to be a huge issue with my dogs and I live in NC and my dogs run the woods a lot... I pulled one off of Paris a few days ago.. that the first one of the year I've seen on any of my dogs...
Also I only apply frontline once every 2-3 months.... I've never needed to apply it every month...
Never used promeris... don't plan to, until its been out a while longer first...
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