With his shaggy hair and concrete-chomping teet, Gnasher was the perfect pooch pal for a rebel like Dennis.
They hit it off straight away, and the fun has never stopped!
This comic appeared in Beano No. 1363, which came out on 31st August 1968.
The first Gnasher was drawn by Dennis the Menace artist,David Law, who dreamed up a wild creature who looked like Dennis's hair with ferocious teeth, eyes and legs.