Waterfowl have been an important food source for humans for centuries, and catching and keeping live waterfowl was a tricky endeavor that the Dutch mastered from as early as 1318. This is when the first instance of an eendenkooi, or duck cage, was ever mentioned. Luring and catching ducks requires calmness, silence, and the partnership of a trapper or "kooiker" and his little decoy dog, a "kooiker's hondje" or "kooikerhondje".
Below is a video example of how the Kooikerhondje works in an eendenkooi. An eendenkooi was an elaborate structure with wooden panels and netting that narrowed down into curved canals where the ducks would be trapped. The trapper would send his dog to weave in and out of the panels, piquing the curiosity of the ducks, who would be lured further and further into the canals, following the little orange dog's nimble gait and waving white tail to its demise. The original dogs that were used for this purpose were of spaniel-like type and were described as medium-sized, alert, loyal, and blond of color. Because they worked next to the water and never in it, the love of water is not ingrained into their nature as it is with other sporting breeds.