Simparica Trio for Dogs 20.1–40kg is a monthly oral chew providing broad-spectrum parasite protection for large breed dogs. In a single pork liver-flavoured chew given once a month, it covers fleas, ticks, heartworm disease prevention, and intestinal worms — making it an all-in-one solution for dogs in this weight bracket, suitable from 8 weeks of age.

The active ingredients — sarolaner, moxidectin, and pyrantel — each target parasites through different mechanisms, giving coverage no single-class product can match. Flea killing begins within 4 hours of dosing. The chew also covers paralysis ticks, brown dog ticks, and bush ticks alongside heartworm prevention and treatment of common intestinal worms including roundworm, hookworm, and whipworm. A single monthly dose replaces the need for separate flea, tick, and worming products.

The liver flavour means most dogs accept the chew willingly, removing the need for pilling or topical application. For owners who want full parasite coverage without managing multiple products on different schedules, the single monthly chew format is the main reason it becomes a routine rather than a chore.