Heartgard Plus Chewable Large Dog (Brown) 6 Pack Heartguard Plus Chewable Tablets are to be given monthly, for the prevention of Heartworm. Heartguard Plus, also controls Roundworms and Hookworms. Real Beef Flavour. Hearguard Plus can be used in all breeds of dogs, including stud dogs, and breeding bitches. Can also be used in puppies that are over 6 weeks of…