Snail Tails is a book read to Patrick by Gary in the episode "Pet Sitter Pat." It is most likely a compilation of stories about snails from medieval times, judging by the cover.
The book's cover is pale brown and depicts the title written in all caps in grayish-white text. Under the title is a picture of two snails, one dark blue and another pink like Gary and wearing a crown, in front of a gray castle.
Role in episode
When SpongeBob runs home from his grandma's house after worrying that his house might have caught on fire, he finds Gary reading Snail Tails to Patrick. SpongeBob knows it is a good story, while Patrick thinks it is called "Meow-meow-meow," due to Gary's vocabulary of a cat.