Heartgard Plus Chewables For Small Dogs Up To 11Kg Blue is a vet-recommended heartworm disease prevention treatment that also controls and treats intestinal worm infections. HeartGard Plus is highly effective against immature stages of heartworm that are transmitted through a mosquito. It also treats and controls four species of hookworms and two species of roundworms. This monthly treatment has antiparasitic and anthelmintic properties that work against mixed parasitic infections, protecting your dog from potential health problems. It comes in a real beef flavour, which makes it exceptionally palatable in taste for dogs. This monthly treatment is safe and suitable for dogs 6 weeks of age and older as well as breeding, lactating, and pregnant dogs. HeartGard Plus can be safely administered to dogs of positive, negative, or unknown heartworm status.