In temperament the Kooikerhondje is friendly, alert and energetic. It is affectionate and lively with its own people, often reserved with strangers, and tends to be sensitive to a harsh voice.
It is a compact, spaniel-like dog with a medium-length, straight or slightly wavy coat of clear orange-red patches on white. Long black tips on the ears, known as earrings, are a prized feature, and the well-feathered tail with its white plume is carried level or slightly raised. That plume is the flag that draws the ducks.
The Kooikerhondje takes its name from the kooiker, the man who managed a Dutch duck decoy. Small orange-and-white spaniels of this type appear in Dutch paintings of the seventeenth century, including works by Jan Steen. One story says a dog of this kind woke William of Orange when Spanish troops raided his camp in the sixteenth century, but this is a legend rather than a known fact. By the nineteen-thirties the type had almost disappeared, so the modern breed was rebuilt from very few dogs. The breed still works at some decoys, which are now often used to catch ducks for ringing and study rather than for the table.