Tetrapodophis only makes a brief appearance when Arlo and Spot encounter it on their journey. It first appears when Arlo starts eating berries and Tetrapodophis falls on him and Arlo shakes it off. Confronted by the Tetrapodophis after falling off the cliff, Spot was able to wrestle it to save Arlo from the predator, thus retreating. It isn't seen for the rest of the film after this.
Soundtracks:The Good Dinosaur Video Games:Disney INFINITY: 3.0 Edition • Dino Crossing Books:Read-Along • Hello, Arlo • Golden Book • A Friend in the Wild • The Junior Novelization • The Journey Home • Spot Leads the Way • Creatures and Critters! • Crash, Boom, ROAR! • A Wild Adventure! • A New Best Friend • A Berry for Arlo • A Boy Named Spot/A Dino Named Arlo • Big Golden Book