Sandy's fur
Object
Sandy's fur is an object that is attached to Sandy. It appears in every episode Sandy appears in, but plays its biggest role in "Someone's in the Kitchen with Sandy." It is first seen off of her in "Survival of the Idiots."
Role in series
"Someone's in the Kitchen with Sandy"
Plankton steals Sandy's fur while Sandy is showering. He masquerades as Sandy by wearing her fur and walks to the Krusty Krab. Plankton asks SpongeBob for information about the Krabby Patty, and SpongeBob, thinking he is talking to Sandy, obliges and tries to teach him how to make a Krabby Patty.
After a long and tedious lesson, Plankton gives up and takes the secret formula and attempts to escape. However, Sandy soon enters the Krusty Krab and takes back her fur coat, trapping Plankton in a jar of mustard.