Dear Doggchopper, please don't neglect to continue the heartworm pill. Most homeopaths will agree that this is one of those things that have to be done. Once the worm enters the system, the dog is doomed. The only way to make sure this doesn't happen is by giving the pill every month. I also hated to do it, but I do. I try to stretch out the frequency, but never skip, especially during heart worm season. There was a pretty long discussion about this a couple of months ago. Check the archives. Best wishes, Mselle