Heartgard Plus is heartworm prevention medication for dogs that’s in a chewable beef-flavoured tablet that dogs love. It defends against heartworm infections dogs can get when they are bitten by mosquitoes - something that is difficult to prevent if your dog is outdoors regularly. Heartgard Plus is a very valuable resource for these pet owners because if left unchecked heartworm disease can eventually be fatal for the dog. Fortunately, Heartgard Plus chewable provides year-round protection against heartworm disease when taken just once a month.