Description This 6 pack of Heartgard is suitable for preventing heartworm in dogs weighing between 23kg to 45kg. Potentially deadly heartworm disease is a threat no matter where you live. Just one bite from an infected mosquito can transmit larvae to your dog that can eventually cause severe damage and even death. The monthly real-beef chewables made by Heartgard Plus (ivermectin/pyrantel) help prevent heartworm disease in dogs and puppies from 6 weeks of age. SKU: 122614000058 122614000058 Additional Information Ingredients: Ivermectin 272mcg, Pyrantel 227mg per chewable. Manufactured In: United States (Puerto Rico) Breed Size: Large Life Stage: All Health Benefit: Heartworm Pet Weight: 23 to 45kg Product Type: Chewable Tablet Dosage: Monthly Pet: Dog Product Category: Flea, Tick & Worming