Protecting dogs from heartworm disease is essential for lifelong health. The following selected products are commonly used, vet-recommended preventives and chews that help block heartworm transmission while also addressing additional parasites. This guide highlights five options suitable for different dog weights and needs, with quick access to each product’s Amazon listing.
| Product | Weight Range | Format | |
|---|---|---|---|
| HEARTGARD Plus (Blue Box) for up to 25 lbs | Up to 25 lbs | Real-Beef Chewables | Heartworm prevention; also treats and controls roundworms & hookworms |
| HEARTGARD Plus (Brown Box) for 51–100 lbs | 51–100 lbs | Real-Beef Chewables | Heartworm prevention; also treats and controls roundworms & hookworms |
| TRI-HEART PLUS for up to 25 lbs | Up to 25 lbs | Chewables | Prevents heartworm; also treats and controls roundworms & hookworms |
| TRI-HEART PLUS for 51–100 lbs | 51–100 lbs | Chewables | Prevents heartworm; also treats and controls roundworms & hookworms |
| Simparica Trio | 22.1–44 lbs (1 tablet) | Chewable tablet | Triple protection: heartworms, ticks & fleas, and intestinal worms |
Note: This summary is informational and reflects typical product use. Always consult a veterinarian to determine the best heartworm prevention plan for your dog.
HEARTGARD Plus Up To 25 Lbs Real-Beef Chewables
Product name: HEARTGARD Plus (ivermectin/pyrantel) Real-Beef Chewables for Dogs up to 25 lbs. Brand: HEARTGARD. Features: Vet-recommended heartworm preventive; effectively prevents heartworm disease; also treats and controls roundworms and hookworms. This option is designed for smaller dogs requiring a beef-flavored chew that’s easy to administer. A 6-month supply is standard in listed variants, with dosing aligned to weight for protection against heartworms and common intestinal parasites.
HEARTGARD Plus 51–100 Lbs Real-Beef Chewables
Product name: HEARTGARD Plus (ivermectin/pyrantel) Real-Beef Chewables for Dogs 51-100 lbs. Brand: HEARTGARD. Features: Vet-recommended heartworm preventive; effectively prevents heartworm disease; also treats and controls roundworms & hookworms. Suitable for medium to large dogs, with a proven track record of heartworm prevention and intestinal parasite control. Often sold as a 6-month supply, with weight-based dosing for reliable protection.
TRI-HEART PLUS Up To 25 Lbs
Product name: TRI-HEART PLUS Chewable Tablet for Dogs, up to 25 lbs. Brand: TRI-HEART PLUS. Features: Prevents heartworm disease, treats and controls roundworms and hookworms, kills heartworm larvae before they reach the heart, provides year-round protection with monthly dosing. This blue-box variant is tailored for smaller dogs and includes a six-chew package for a six-month supply.
TRI-HEART PLUS 51–100 Lbs
Product name: TRI-HEART PLUS Chewable Tablet for Dogs, 51-100 lbs. Brand: TRI-HEART PLUS. Features: Precedes heartworm disease, treats and controls roundworms and hookworms, kills heartworm larvae before they reach the heart, and offers year-round protection with monthly administration. This brown-box variant is designed for medium to large dogs, aligning dosing with weight class for effective prevention.
Simparica Trio Chewables
Product name: Simparica Trio (sarolaner, moxidectin, and pyrantel) Chewable Tablets for Dogs. Brand: Simparica Trio. Features: Triple protection against heartworms, ticks & fleas, and intestinal worms. Approved for puppies as young as eight weeks and weighing at least 2.8 pounds. Provides 100% heartworm protection in studies and is noted for broad tick coverage and gutworm control, making it a comprehensive preventive option in a single monthly chew.
Buying Guide
Key considerations when choosing a heartworm preventive for dogs include weight-based dosing, parasite coverage, preventive schedule, palatability, and vet recommendations. The following perspectives can help owners compare options:
- Weight range and dosing: Select a product that precisely matches the dog’s weight to ensure proper protection. Many brands offer multi-weight packaging, but mixing incorrect weights can compromise effectiveness.
- Heartworm coverage and additional parasites: Some meds protect only against heartworms, while others also address roundworms, hookworms, and even ticks or fleas. Consider your dog’s exposure risk and any existing parasite concerns.
- Administration and palatability: Chewables with beef flavors are often easier to administer than pills. For picky eaters, flavor and texture can influence adherence to monthly dosing.
- Veterinary guidance: Heartworm prevention is a long-term commitment. Regular veterinary checkups and blood tests help ensure effectiveness and detect any issues early.
- Safety and contraindications: Review any potential interactions with other medications or preexisting conditions. Some products have age or weight minimums; ensure your dog meets criteria.
- Dosing schedule: Consistent monthly dosing is crucial. Some products require year-round administration, while others may offer seasonal considerations based on climate and exposure.
When selecting a heartworm preventive, align the product’s features with your dog’s lifestyle, weight category, and regional parasite risks. Always confirm the plan with a veterinarian to ensure optimal, ongoing protection.