Dog Piggy Bank Tri-Heart Product Lineup

SAME Heartworm
Protection1 FOR DOGS

at a Lower Price3
for owners.

Proven Pet Protection

Save on heartworm protection and internal parasite control without sacrificing value.


Contains Ivermectin/Pyrantel, proven active ingredient for heartworm protection


Prevents heartworm disease, treats and controls roundworms and hookworms2


Easy-to-give, beef-flavored, chewable2

Dollar Signs

20% lower price3

Save On Proven
Heartworm Protection

Tri-Heart® Plus uses the same molecule as the leading competitor, making it just as effective at preventing heartworm disease and treating and controlling roundworms and hookworms.

  • Consistent heartworm medication keeps your dog protected
  • Costs 20% less than Heartgard®, making it affordable year-round3
  • Preventing heartworm costs 15x less than treating an infected dog4
Star Dog
Larvae Being Killed by a Magic Wand Dog

Kill Larvae From The Start

Heartworm disease starts with a mosquito bite infecting your dog with worms that live and reproduce in the heart and pulmonary arteries. Keep your dog safe and stop the dreaded infection cycle with Tri-Heart® Plus.

  • Kill heartworm larvae in their tracks
  • Treats and controls roundworms and hookworm parasites
  • Enjoy year-round protection for your pet

A Chewable Your Dog Will Enjoy

Provide your dog with a palatable beef-flavored chewable that provides premium protection for him and savings for you.

  • 94% of dogs love the chewable tablets5
  • In a taste test dogs proved to have no preference between Tri-Heart® Plus and Heartgard® Plus5
Sparkles Hand Holding Tri-Heart

Heartworm Prevention For Every Size Dog

A simple and palatable monthly, chewable tablet protects by killing the larvae before they reach your dog's heart.

Heartworm Prevention For Every Size Dog

A simple monthly tablet protects by killing the larvae before they reach your dog's heart.

100 Percent Satisfaction Guarantee

100% Satisfaction Guarantee

A taste test of Tri-Heart® Plus Chewable Tablets vs. Heartgard® Plus Chewables showed that dogs have no preference. If your dog doesn’t accept the flavored chewable tablet, the full purchase price of the product will be refunded.

They'll Be Protected From Heartworm Disease
Following the Tri-Heart® Plus year-round protocol and once qualified for the Guarantee, if your dog is diagnosed heartworm positive, the Tri-Heart® Plus Guarantee covers:

Your veterinarian simply contacts Merck Animal Health prior to commencing the tests. After confirming adherence to the Tri-Heart® Plus protocol and testing, your veterinary service fees will be covered by us.

As long as the dose was administered within 31 days.

With a diagnosis of heartworms, a free one-year supply of Tri-Heart® Plus will be provided. 

If for any reason you are not satisfied, speak to your veterinarian or call our toll-free guarantee center at 1-800-224-5318 for replacement or refund.

Click Here for complete details.

Stars Hand Making the OK Sign

Start Saving With Tri-Heart® Plus Today


The same active ingredients for heartworm protection and internal parasite control as the leading competitor, but at a lower price.


Please refer to Tri-Heart® Plus Prescribing Information for more detail.


Average discounted price of Tri-Heart® Plus compared to Heartgard® Plus. December 2016, 57-69 US Flea and Heartworm Markets, Brakke Consulting and Average price of Tri-Heart® Plus compared to Heartgard® Plus as per Price List, Merial® Brand Pet Products effective February 1st, 2017.


American Heartworm Society. (accessed May 18, 2017).


September 2000, ANADA 200-338, Palatability of Chewable Tablets. Heska Corporation Submission

All dogs should be tested for heartworm infection before starting a preventive program. In a small percentage of ivermectin/pyrantel treated dogs, digestive and neurological side effects may occur.

HEARTGARD is a registered trademark of Merial.