and two dogs may die from it because they are too weak to endure the "excruciating and debilitating treatment." HeartGard is a beef-flavored, chewable tablet that is given monthly to dogs. Merial also ...

Heartgard protects dogs from heartworms for up to a month ... is approved to work up to 12 weeks while Merial's NexGard, a chewable approved by the FDA last year to prevent and kill fleas and ...