Proheart 6 is the new heartworm product from Ft Dodge. It is an injectable product that prevents heartworms for 6 months. It contains moxidectin, which is similiar to ivermectin. The company has not done any work with cats or ferrets at this time. It is a good product for dogs, but we do not know about its use in ferrets yet. Jerry Murray, DVM PS Proheart has been out in Australia for a while now, so even though it is a new product here it has been used down under for a while. [Posted in FML issue 3505]