Here are a couple articles. Use extreme caution if your dog is a Collie, or part Collie with Ivermectin. I understand it can kill them Jonni http://www.internetvets.com/Articles/ivermectin_dosing.htm http://petplace.netscape.com/articles/artShow.asp?artID=1525 =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= Ridecamp is a service of Endurance Net, http://www.endurance.net. Information, Policy, Disclaimer: http://www.endurance.net/Ridecamp Subscribe/Unsubscribe http://www.endurance.net/ridecamp/logon.asp Ride Long and Ride Safe!! =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=