Which heartworm preventive is commonly given to dogs as a monthly chewable?

Heartgard is a widely recognized heartworm preventive that is specifically formulated for dogs and is typically administered as a monthly chewable tablet. Its active ingredient, ivermectin, works effectively to prevent heartworm disease by killing the larval form of heartworms that are transmitted through mosquito bites.

The convenience of a chewable form makes it easy for pet owners to administer, as many dogs readily accept it as a treat. Moreover, Heartgard not only targets heartworms but also offers protection against other parasites, specifically certain types of intestinal worms, thereby providing a comprehensive preventive care option.

In contrast, other choices do not fit the description of a dog-specific heartworm preventive offered in a chewable format. Revolution is primarily a topical treatment that protects against a variety of external and internal parasites but is not specifically a chewable heartworm preventive. Advantage is used mainly for flea control and does not target heartworms. Frontline, like Revolution, is primarily a topical flea and tick treatment and does not serve as a preventive for heartworms in dogs.