sentences:  The ancestral type of the Wetterhoun was developed at least 400 years ago in the Dutch province of Fryslan.The origins of the Wetterhoun are conjectured to be from Gypsy dogs, crossed with an indigenous Frisian dog, perhaps the Old Water Dog, a type which is now extinct.Dogs of this type were kept for the difficult and dangerous hunting of fitch ("Mustela putorius") and otter ("Lutra lutra") in the water.