Gary the Snail is a snail and SpongeBob SquarePants' pet. He usually can only say, "Meow", while sea worms in the show bark, which indicates that snails are the ocean equivalent of cats and worms are dogs. In some episodes, Gary has said something other than "meow" but this is rare. Gary is the sixth or seventh main character of the show, but he has the fifth most appearances in the SpongeBob series.
In many episodes, it has been indicated that Gary is very intelligent, the biggest hint of which was in Sleepy Time, where Gary spoke in his dream (that SpongeBob was interrupting) and sounded very old and wise.