The Wetterhoun is a medium-sized dog between 55 and 59 centimeters (21.5-23 inches) at the withers. They weigh between 25 and 35 kilos (55 and 77 pounds). Their coat is thick and curly except for the head, ears and legs, where the coat is smoother; the water repellant coat is described as having a greasy feel. Coat colour may be solid black or brown, or black with white, or brown with white, with or without white ticking or roan marks. The texture of the coat should not be woolly, as such fur will not resist water. The ears are low set and hang flat to the head, and the tail curls tightly over the back. The breed has an unusual, somewhat grim expression due to the shape of the eyes, which marks it as different from other dog breeds.

This breed is an excellent gun dog, effective as both a land and water retriever, however its strong will and natural guarding abilities make early training a requirement. The breed standard describes the breed’s temperament as reserved and “an ideal guard-dog”. though never aggressive, which makes it an excellent family-dog. Although described as “strong willed” the Wetterhoun is never stubborn or wilfully disobedient. Perseverance is a much better term, because they finish what they started, whatever it takes. Imperturbable they finish what they think to be their task. Thereby the breed is sensitive and should never be treated or trained harshly. Brought-up and used to children, they are tolerant to children to the point where the dog should be protected against the children instead the other way around.