NexGard Chew for Dogs 25.1–50kg (blue pack) is the large-dog dose of Merial's monthly beef-flavoured flea and tick chewable. This 3-pack covers three months of treatment. It handles external parasites only — fleas, ticks, mites and lice — and is often paired with a separate heartworm and intestinal wormer rather than combined into one product.

The chew kills fleas fast enough to break the flea life cycle within 24 hours and holds cover for a full 35 days. It controls all three Australian tick species, including the paralysis tick, plus demodex and sarcoptic mange mites and biting lice. Because it's a systemic chew rather than a topical, there's nothing to wash off after swimming or bathing, and no residue on coats or furniture. The beef flavouring makes it accept as a treat for most dogs.

Large-dog owners often choose NexGard specifically because dosing a topical across a big coat is messy and unreliable, and because paralysis tick coverage is non-negotiable in tick-prone parts of the country. The chew format also suits multi-dog households where topicals risk transfer between animals.