The Dog (SNPP) is a dog who is a possible employee at the Springfield Nuclear Power Plant. The plant has a previous history of hiring animals like Stewart. He is also a possible co-worker of Homer Simpson.
At the Springfield Nuclear Power Plant, all the workers are seen sleeping, including Homer and Charles Montgomery Burns. However, Homer presses a button, causing the plant to start self-destructing. The dog, next to Homer, wakes up and averts the meltdown by pulling a lever. The voice-over says "Good boy." This leads the possibility he is a regular employee, who often averts meltdowns.