Ticks are a big problem here in Wisconsin... both my dogs have had Lymes Disease as well as Erlicheosis, one nearly dying from the latter. We have one of the highest tick born illness rates among humans in the nation as well. Both Lyme's and Erlicheosis are tick born diseases. While I have yet to see a tick on either of my goats I'm taking no chances. I have used a product called DuraGuard made by Absorbine http://www.absorbine.com/products.html?catid=flycontrol&pageid=32 . It is rated to kill ticks and so far, used as directed, it has had no ill effect on the goats and seems to work better then most such products.