Gnasher the Abyssinian Wire-Haired Tripe Hound is Dennis the Menace's pet dog and sidekick who often helps him do his menacing whom Dennis is never seen without (except when he's at school because of strict policy forbidding dogs from entering school) proving the duo to be inseparable. He has been a supporting cover star for Dennis since 1974.
Gnasher also has a son called Gnipper and five daughters; Gnatasha, Gnanette, Gnancy, Gnaomi and Gnorah. Gnipper is so called because of his single very sharp tooth.
Gnasher's fur is so tough that not even scissors, garden shears or electric shavers are able to cut it. His teeth are also the toughest in Beanotown. That's why he likes to bite posties on the behind as a hobby.
- Gnasher gets his meaningful name from a British slang term for a pair of teeth.