Heartgard is one of the oldest and most popular stand alone heartworm preventatives. Although it has literally been around for decades, it is still as effective and popular as ever. Heartgard is ivermectin and although at the labeled dose it has been proven safe in Collies, many people still choose to use other drugs in these and other MDR1 breeds. Rightfully so, as there are many alternatives available for use in these pets. Heartgard is a beef chew, that dogs find very tasty, which prevents heartworm disease and some intestinal parasites.
For details on heartworm disease, see our earlier post.