heartworm prevention OK...Mason got his immiuniztions on Sat for parvio and such..she gave me a pill for worms to give him today Drontol i believe. She than gave me a pill for heartworm prevention. Can i go ahead and give it to him or do i need to wait a couple of days for the regular worm pill to take effect???? I am also putting frontline on him today. Kristy and Mason |