"Proven protection for dogs. Dogs of any age, even older dogs, can become infected with heartworms, roundworms or hookworms - but it's easy to protect your dog! Tri-Heart® Plus flavored chewable tablets contain ivermectin/pyrantel - a proven combination to protect your dog and ensure your complete peace of mind. Tri-Heart® Plus is an affordable prescription and all it takes to prevent parasitic infestations that can literally rob your pets' vitality and shorten their lifespans."