His alternate form, a Pteranodon, is one of the two non-dinosaurs in the Dino Squad.
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The Dino Squad has not yet determined the species of dinosaur his "dino form" is supposed to be (although since Ms. Moynihan never "taught" him how to control his transformations as she did the kids, it's likely his dino form is mostly canine and it bears a resemblance to Andrewsarchus).
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Five teenagers, Roger, Max, Caruso, Fiona and Buzz, gain the power to turn into dinosaurs by getting covered in ooze that mutated their DNA on a school field trip.