The only ones that come to mind or either frontline or comfortis, those should both be safe as they do not contain Ivermectin which is usually the medication the vet uses do treat heartworm positive dogs unless you chose the slow kill method which would be heartguard
I wouldn't put any other Chemical in or on the dog during treatment...The treatment is a Toxic overload to begin with....I wouldn't push it! Karla
go to the health food store. They sell as a supplement for dogs a powder that you put on their food, that is yeast flakes, garlic, and vitamin b12. I mix my own, have 4 dogs and a cat, and am flea free. All natural, and it works. My pets are on it year round.