According to the American Kennel Club, the Japanese Spitz’s height goes from 12 to 15 inches. These puppies usually weigh between 10 to 25 pounds. Many people mistake the Japanese Spitz with the adorable Pomeranian. But, there is a difference in size between these two dogs. If you look up the Pomeranian growth chart, you will see that these pooches are 6 to 7 inches tall and weigh only 3 to 7 pounds. So, the Japanese Spitz is equally cute as the Pomeranian, but it comes in bigger sizes.