They grow up before we even know it. You blink and they are one year old--or about 10- to 15-years-old in dog years. Dunder, the German Shepherd in this video, really does grow up right before our eyes. The dog turns one year old in 40 seconds. If you are or have ever been a pet owner, you know they do grow fast. And, this video is wonderful in capturing that growth. Enjoy!