To this date, this series is made up of 5 different breed of dog heads. Although very similar to the more popular Rosemeade series of realistic dog heads, these dog heads are imports from Japan from the 1950s. In my opinion, they can be harder to find than most of the Rosemeade sets, but not nearly as $$$. They are small, at 2.5'' in height. A proper pair should have different pour holes. This series was first document by Irene Thornburg in her 2nd reference book about shaker series entitled The Big Book of Salt & Pepper Shaker Series on page 14.