Dennis & Gnasher Unleashed! S01 E50 Call Of The Wild

When Gnasher gets sent to dog obedience school for gnashing Mrs Creecher's saxophone, one of Professor Screwtop's inventions, the Chatterbox, allows Dennis to understand animal noises, so he can ask Gnasher why he did it - if only all the other animals in Beanotown would stop chatting to him for a minute!