Gnasher is the most famous dog in British comics, closely followed by The Dandy's Black Bob. He first appeared in Beano issue #1363, dated August 31st 1968 (you can read the full strip here), when Dennis found him on the streets. He was an instant hit, but it took a long time before he was a regular character. He appeared in the following issue, #1364, as a character in Pup Parade illustrated by Gordon Bell.
His next appearence was issue #1370, dated 19th October 1968, and he had changed quite a bit since his first appearence!
As of #1392, dated 22nd March 1969, Gnasher finally started appearing every week with Dennis, something he deserved right from the start!
|#1384 - Gnasher's first appearence in full colour!|
But when did Gnasher become Gnasher? These early strips definatly don't star the Gnasher we know and love today, he was far messier back then! I think I've managed to cut it down to a single issue - #1467, dated 29th August 1970. To be even more precise, I think it's the third panel on Dennis' page that marks the start of our current Gnasher!