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As you might guess from his name, he's fond of gnashing. He's got the toughest teeth in town to prove it! Gnasher is incredibly loyal all of the time ... well, most of the time ... actually, show him a plate of sausages and he'll forget everything. As well as being a dog, he's sometimes a guinea-pig. No, he doesn't do impressions of other animals - he's a (mostly) willing volunteer to help Dennis test his latest inventions.