Clifford the Big Red Dog

Clifford the Big Red Dog or simply Clifford is the main protagonist of the cartoon anime series of the same name and its prequel Clifford's Puppy Days as a puppy. He is voiced by Lara Jill Miller as a puppy, by John Ritter but later voiced by Tom Eastwood  as a giant adult red Labrador. He is adopted by Emily Elizabeth Howard as a puppy and grows enormous.