Clifford's Puppy Days Clifford - at one time, he was just a small puppy, the runt of the litter. Then, Emily Elizabeth's love made him grow big and he became big, red Clifford, the subject of the popular PBS Kids series, Clifford the Big Red Dog. But what about before then? Clifford's Puppy Days explores just that. Set in the big city Clifford and Emily Elizabeth lived in before moving to Birdwell Island, this series features Clifford's adventures when he was just a small puppy.