My thanks to both the ladies who were kind enough to notify me about using the canine Advantage. When I spoke to the people at Bayer, (this was 2 years ago) I was told not to use the canine. It is possible that there was miscommunication or a change in policy. Either way, I am glad to get the information. With 5 cats in the house I will still use the feline, but it is good to know that if needed, I can safely use the canine. getting help from other ferret owners (and giving if able) is one of the reasons I signed up for the FML and because of all the caring fert owners out there I get constantly updated info, corrections where needed, and a chance to hear about how other ferret owners are doing. Its definitely doing its job. Thank you to all. [Posted in FML issue 3177]