Although we are coping with an ice storm at the moment I'm glad you brought the question up. I have been using Revolution on Toby as it also covers Heartworm. My concern this year is West Nile Virus. I live in the Niagara area and there have been quite a few animal and a few people cases in this area. I've read every bug spray/ointment etc. and still can't find anything for Toby. Any anti mosquito products for ferrets? Lynda http://www.geocities.com/tobysdayout/index.html [Posted in FML issue 4109]