SpongeBob introduces Gary to Patrick by playing tag, and they then decide to have a sleep-over together. The next morning, Gary doesn't want to leave Patrick, who concludes that Gary wants to be with him and claims him as his own pet. SpongeBob is heartbroken, and out of jealousy, attempts to find a new pet to show to Gary that he doesn't need him. At first, he gets Rex, a worm, who immediately abandons him and leaves on a bus. Next, he gets Lary, a wild snail who acts viciously hostile toward him.
Later, Patrick and Gary come to SpongeBob's house to do his laundry, and Gary crawls into the washing machine after Patrick's pants. SpongeBob inspects this and realizes that Gary just wanted the cookie in Patrick's pocket. As SpongeBob and Gary, now reunited, go outside for a walk, a heartbroken and defeated Patrick stares after them and shouts, "Gary? I thought what we had was special!".
"Dumped" was ranked #81 during the Best Day Ever event on November 9–10, 2006.
This is the first time SpongeBob says "Gary the snail!" to Gary in the series.
When the camera zooms in on SpongeBob thinking, Patrick is saying "Blah, Blah, Blah" in the background. When the camera zooms out Patrick is speaking normal again, but when SpongeBob leaves Patrick's rock, he says "Blah, Blah, Blah" again.
This is the first episode to show Patrick as the main antagonist.
SpongeBob, in a throwaway joke, reveals that he has another pet snail, "Jerry", a photo-realistic land snail.
This is the tenth episode to have flowers in the title card background.
The face SpongeBob makes when he says "Who's a good boy?!" to Rex can be seen on various SpongeBob licensed products, including the newer packages of SpongeBob-shaped Kraft macaroni & cheese. It's accompanied by the slogan, "grin and square it!".
When SpongeBob carries Gary away from Patrick, it zooms in on Gary, and his sleeve is green.
When SpongeBob gets Lary, he states that Gary's name "will not be mentioned in this household". The next morning, SpongeBob mentions Gary's name.
By the end, it's revealed that Gary just wanted a cookie in Patrick's pants pocket all along. However, throughout the episode, Gary makes no effort to reach his pocket until the very end.
It is unknown whatever happened to Lary the snail.
When SpongeBob's alarm goes off, he doesn't press the button to make it stop, the alarm stops by itself.