Not sure if same dog, unless color changed and muzzle grew longer. The adult looks like an Alaskan Malamute, which do get rather large. We had a cross-breed, Alaskan Malamute and Siberian when we lived in Colorado. She was three years old when we got her and she REALLY loved the snow. Here's a picture of her on our boat, when we lived there. She even had her own life vest.