Besides ivomec/Heartgard there are 2 other heartworm preventative options.
Interceptor, the brown 0-10 pound dog size, can be used. It is given once
a month orally. The other option is Revolution. The 5-15 pound cat size
can be used. This is applied once a month over the shoulder blades. I
also use the Interceptor tablets for my ferrets. They both will actually
eat the beef flavored tablet on their own.
Hope that helps,
Jerry Murray, DVM
[Posted in FML issue 3625]