(UK) A guide dog.

A puppy; a young dog.

A dog trained to use its sense of smell to locate traces of accelerant at sites of a suspected arson.

A specialized form of police dog; trained to use its sense of smell to detect and locate evidence of illicit substances, from illegal drugs to explosives materials, which may be carried on a person in their effects.

A detection dog trained to use its sense of smell to locate illicit substances, such as drugs, which may be carried on a person in their effects.

Any dog bred, trained or used for the purpose of attacking a target, either on command or on sight; trained either as a specialized form of police dog or a security force dog.

(archaic) A Great Dane.

A female dog; a bitch.

A dog that was deployed in a war. / A veteran soldier, particularly a heroic one, in a war. / (figuratively) A warrior; a battler.

(obsolete) Extremely weary.