Spot is the pet of Plankton, just like his owner he is an amoeba.

Spot acts like a dog, as he barks and can wag his tail just like an actual dog does. Though the only thing that is strange is that even though Spot does act like a dog, in the SpongeBob universe, worms are considered to be the dogs, though it is possible that it differs for amoebas. He first appeared in the season 9 episode "Plankton's Pet."

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