Did you know that heartworm is carried by the common mosquito and can be deadly to dogs of all breeds and ages? Heartworm can be prevented with a cost effective monthly preventative such as Heartgard Plus, Interceptor Spectrum, Milbemax or Guardian. These combination heartworm and intestinal worm products also provide broad spectrum protection against all common intestinal worms such as roundworm, hookworm and whipworm.