From SpongePedia, the First SpongeBob Wiki.
Plankton's Labrador is Plankton's pet. It was seen in the episode Plankton! in the room before the analyzing room. Plankton calls him his LAB, and he is shown in realization. SpongeBob is afraid of him.
- In the rest of the episodes, when Plankton walks through the 'kitchen door' He goes straight to his laboratory, not seeing LAB first.