Yes it is important...Maximus is an indoor dog but we were advised by the vet on the first visit that he will begin taking the heartworm pill after his vaccinations and he will have to take them 1x a month for the rest of his life....it cost me 35.00 for a year supply..I beleive and from what the vet told me that it is nothing compared to the cost of curing heartworm...the pill the vet gave me is called Interceptor |