Is anyone using Ivermectin to kill fleas and ticks on dogs? Because we put our dogs in water almost daily, I am concerned the Frontline or any topical flea/tick isn't effective. I recall there was a discussion here about Frontline being effective for about 3 weeks instead of a month. And, I will gladly apply Frontline more often to prevent Lyme, erlichiosis, etc. However, if Ivermectin can be used safely and is effective, I would use it. We have Lyme and other tick diseases in the MN, WI, area. I found this link with some information: http://www.ehow.com/about_5444740_cattle-ivermectin-dogs.html