Manny's Goldfish was the fish Manny bought in Diary of a Wimpy Kid Online, but in Dog Days, he bought fish food.

Online Version

In Diary of a Wimpy Kid Online after Greg’s birthday, Charlie Heffley took them to buy pets Rodrick was looking at a snake, while Greg and Manny were looking at fishes, but Susan Heffley told Rodrick it was dangerous and forbade him. So Rodrick took an aggressive fish while Greg got an Angelfish and Manny got a goldfish. Rodrick's Fish soon ate Manny’s goldfish and attacked Greg’s at the same time.