Interceptor Spectrum Blue for Large Dogs in the 3-pack format is a monthly chicken-flavoured chew for dogs weighing 22 to 45 kilograms. It prevents heartworm disease and treats intestinal worms in a single tasty treat, with three months of cover per pack.

Each chew prevents heartworm infection and controls adult roundworm, immature roundworm, adult whipworm, adult hookworm and adult tapeworm including Echinococcus granulosus (hydatid tapeworm). The chew is highly palatable and is designed to be eaten as a treat rather than hidden. The Blue dose band is calibrated specifically for large-breed dogs between 22 and 45 kilograms, covering most Labrador, Retriever and larger build breeds.

Interceptor Spectrum is widely recommended for owners who specifically want heartworm and intestinal worm coverage without bundling in fleas or ticks, because it allows them to run their chosen external parasite product separately. The 3-pack is the shorter starter size for owners new to the product.