The Ferrets are animals that reside in the pet store. When Milo tried to fly, he accidentally crashed to the lamp and set off the smoke alarm and the fire sprinklers. The Ferrets got angry at Milo and made fun of him. At the end when Milo, Oscar, Bea, and Mr. Mussels was riding at the Bird and crashed into the lamp, the Ferrets were angry at them again ("Flying Fish").
- Milo calls them "snake-dogs".
- Some of them were cheerleaders in the "all-species" cheer-off (We've Got Fish Spirit)