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Snellie is a female snail that has a purple shell with a dark purple swirl. She has a large pink bow tie on the top of her shell. Her eyes have blue irises with black pupils.
She appears in the episode "The Great Snail Race," where she races against Gary, and Patrick's rock. Squidward keeps Snellie away from Gary because of his hatred of Gary and SpongeBob. Gary is pushed too hard by SpongeBob and gets hurt badly. Snellie goes back to him instead of finishing the race to see if he is okay. In the end, Gary and Snellie seem to have fallen in love with each other and go off the track together. Snellie and Gary tend to be partners, but she has not been shown with Gary in any other episodes. It is unknown if she is still Squidward's pet. Snellie and Gary probably aren't dating anymore since Gary fell in love with Mary in the episode "Gary in Love."
- A snail similar to Snellie appeared in "The Sponge Who Could Fly," as a pet of Mrs. Puff.
- Snellie's snail carrier is a collectible item in Truth or Square the game. When it is viewed in the hub, Snellie's eyes poke out, along with Snellie's meowing, before they see each other and go back into the carrier. In the DS version, Snellie herself replaces the item.
- Though Snellie is supposed to be Squidward's snail, she was never seen again in the series.