> To my knowledge, the monthly preventative which is used in dogs > has never been testedon ferrets, so you're certainly taking a > big risk there. Dr Williams - I find this somewhat distressing. Here in Miami, heartworm capitol that it is, Interceptor seems to be the heartworm preventative of choice for ferrets. I don't have a package that lists the chemical makeup of this brand, but it's a monthly pill as you mentioned. Perhaps you're familiar with it. Should I question my vet about this? As a member of the Miami Ferret Club, I know lots of people with ferrets and they all use Interceptor and to the best of my knowledge, there has never been a case of heartworm in a Interceptor treated ferret. Pure luck perhaps? Anyway, I'm now worried. I had a dog that got heartworm and it's not fun. mike [Posted in FML issue 0719]