Coin Dropping Dog Piggy Bank Dog Piggy Bank



easier-to-swallow price


Tri-Heart Pill = HeartGard Plus Pill
Tri-Heart® Plus Heartgard® Plus

The Same proven Active Ingredients
as the Leading Heartworm Preventative Brand1


Proven Heartworm Protection That You and Your Dog Will Love

Tri-Heart® Plus provides proven heartworm disease prevention for your pet with year-round savings for you.

Heart Man with his dog
Heart Man with his dog

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.

Dog Illustration 1 Bite from an Infected Mosquito is All That it Takes

Stop The Infection Cycle

A mosquito carrying heartworm larva can infect your dog with worms that develop and reproduce inside him. Treatment for heartworm disease can be long and costly, and is no guarantee a dog will survive.

Once a dog is infected he is also at risk for spreading heartworms to other dogs by infecting new mosquitos. Tri-Heart® Plus keeps your dog safe and helps prevent the spread of infection.

Just as effective, just as palatable

94% of dogs love the chewable tablets.3

A taste test of Tri-Heart® Plus Chewable Tablets vs. Heartgard® Plus Chewables showed that dogs have no preference.3

Dog Dog
Sparkles Hand Holding Tri-Heart Hand Holding Tri-Heart
From the company you trust - MERCK Animal Health
100 Percent Satisfaction Guarantee

100% Satisfaction Guarantee

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. In the unlikely case of infection arising while on Tri-Heart® Plus our new comprehensive guarantee sheet covers treatment drug costs and veterinary service fees.

Click Here for complete details.


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.


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.


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.