Tri-Heart Plus is highly rated by pet owners for its cost-effectiveness and identical active ingredients to brand-name alternatives like Heartgard Plus . It is a prescription-only monthly chewable that prevents heartworm disease while treating roundworms and hookworms. Expert & User Highlights According to reviews from Chewy and PetCareRx , users value: Tri-Heart Plus Chewable Tablets For Dogs - Allivet