Choosing a reliable heartworm preventive is essential for keeping dogs healthy and free from common parasites. The following selections are among the most trusted products in the market, offering heartworm protection plus coverage for additional intestinal worms and parasites. This overview highlights five proven options, helping owners compare dosing, coverage, and flavor preferences to fit their dog’s needs.
| Product | Brand | Dog Size/Dose | Key Benefits |
|---|---|---|---|
| HEARTGARD Plus Real-Beef Chewables (Up To 25 lbs) | HEARTGARD | Small dogs (up to 25 lbs) | Prevents heartworm; treats roundworms & hookworms; beef-flavored |
| HEARTGARD Plus Real-Beef Chewables (51-100 lbs) | HEARTGARD | Medium to large dogs (51-100 lbs) | Prevents heartworm; treats roundworms & hookworms; beef-flavored |
| Interceptor Plus (8.1-25 lbs) | Interceptor | Small dogs (8.1-25 lbs) | Prevents heartworm; protects against multiple worms; chicken-flavored |
| NexGard Plus (8.0-33 lbs for some formulations) | NexGard | Small to medium dogs (varies by weight tier) | Flea, tick protection plus heartworm prevention; beef flavor |
| Trifexis (60.1-120 lbs) | Trifexis | Medium to large dogs (60.1-120 lbs) | 5-in-1 protection including heartworm; fleas and several worms |
Note: The suitability of a product depends on your dog’s weight, health status, and veterinarian guidance. Always consult a vet before starting or changing a parasite prevention plan.
HEARTGARD Plus Real-Beef Chewables — Up To 25 lbs
HEARTGARD Plus is a veterinarian-recommended heartworm preventive. It effectively prevents heartworm disease and also treats and controls roundworms and hookworms. The beef-flavored chewable is designed for small dogs up to 25 pounds, simplifying monthly dosing for many households.
HEARTGARD Plus Real-Beef Chewables — 51-100 lbs
This HeartGard formulation is designed for medium to large dogs, providing heartworm prevention while also addressing roundworms and hookworms. The real-beef chewable format can help with consistent monthly administration for dogs in the 51–100 pounds range.
Interceptor Plus for Heartworm + 4 Other Worms (8.1-25 lbs)
Interceptor Plus protects against heartworms and a broad range of worms, including hookworms, roundworms, whipworms, and tapeworms. It comes as a tasty chicken-flavored chew, making monthly dosing straightforward for small dogs within 8.1–25 pounds.
HEARTGARD Plus — 25 lbs and Under (1 Month)
This option provides a one-month supply of Heartgard Plus for dogs up to 25 pounds. It continues to offer heartworm prevention plus control of roundworms and hookworms, maintaining regular monthly protection for small breeds.
NexGard Plus — Flea, Tick, and Heartworm Protection
NexGard Plus combines flea and tick protection with heartworm prevention in a soft beef-flavored chew. It targets fleas and five tick species, providing broad external and internal parasite control with monthly dosing. It is suitable for a range of weights depending on the specific product tier.
Trifexis Heartworm Prevention
Trifexis provides 5-in-1 protection, including heartworm prevention, fleas control, and treatment of several intestinal worms. It is designed for dogs weighing 60.1 to 120 pounds and offers rapid flea kill in addition to preventive coverage against heartworms and other parasites.
Credelio Quattro — 25.1-50 lbs
Credelio Quattro offers broad parasite protection in a single monthly chew, covering six parasite types. It includes heartworm prevention and protects against common intestinal worms, with an easy-to-administer flavored tablet for dogs in the 25.1–50 pounds range.
Buying Guide: Key Purchase Considerations
- Weight and age: Ensure the product’s weight range matches your dog’s current weight and age. Some formulations are weight-specific and require reevaluation as your dog grows.
- Parasite coverage: Decide whether you need heartworm protection alone or comprehensive coverage against fleas, ticks, and intestinal worms. Some products offer multi-parasite protection in one chew.
- Flavor and palatability: Flavor (beef, chicken) can influence dosing consistency, especially for picky eaters.
- Expiration and storage: Check expiration dates and store chews as directed to maintain potency and safety.
- Veterinary guidance: If your dog has existing health conditions, discuss potential drug interactions or contraindications with a veterinarian.
- Brand reliability: Consider products from established brands with veterinary recommendations and clear labeling.
- Administration practicality: Monthly dosing schedules, chew format, and even multi-dog households impact choice.
- Resistance and formulation: Some products include additional parasite coverage; evaluate whether this aligns with regional parasite prevalence.
- Cost considerations: Compare ongoing costs across products, factoring in chew counts per bottle and supply duration.
All product selections above are intended to illustrate commonly used heartworm preventives and related parasite protections. For tailored recommendations, consult a veterinarian who can assess your dog’s health status, environment, and risk factors.