What is "kooikerhondje"

The Kooikerhondje (literal English translation "little cager hound" or "little caging hound") is a small spaniel-type breed of dog of Dutch ancestry that was originally used as a working dog, particularly in an eendenkooi ( duck cage) to lure ducks. Kooikers were popular in the 17th and 18th century and appeared in the paintings of Rembrandt and Jan Steen. The breed is rapidly gaining popularity in the United States, Canada and Scandinavia, where it is still relatively unknown.