PD Shadow assisted the firearms team in dealing with the armed man on Sunday night.
The man was walking round North Leeds with a Samauri sword before he was caught by the pooch and specialist officers.
The police used their #onelessweapon hashtag on Twitter after they had dealt with him.
A tweet from the West Yorkshire Police dogs account said: "PD shadow assisted the firearms team last night deal with a male walking around North Leeds with a Samauri sword. #onelessweapon"