Dustin is one of the smartest kids in the group. He’s loyal, curious, and logical. That’s why his decision to keep Dart, the Demo-Dog, was so baffling. He discovered a strange creature and chose to care for it. At first, the threat wasn’t obvious. Once the group realized Dart was connected to the Upside Down, Dustin still protected it.
The creature eventually caused harm. Dustin ignored warnings from Will and others. Dart killed a family pet, and the danger became clear. Dustin then placed Dart’s body in a fridge, but the show never showed what happened next. That scene was never revisited.
