Advantage Blue for Dogs 25–50kg is a single-dose spot-on flea treatment for extra-large dogs. It kills fleas and larvae on contact without needing them to bite, providing fast relief within 3–5 minutes of re-infestation.

The imidacloprid formula kills fleas on contact and targets flea larvae in the dog's surroundings, helping to break the environmental flea cycle. The single-dose format suits owners topping up an existing supply or trialling the product before committing to a larger pack. Water-resistant once dry, and also controls biting lice.

A single-dose pack is the simplest entry point for extra-large dog owners who want to test Advantage before buying a multi-pack, or who need a one-off top-up between regular purchases.