Pair of Vintage Dutch Porcelain Dogs found in France

This charming pair of white ceramic dogs appear to be spaniels and are Dutch in origin. These little figurines have a very interesting background relating to the Red Light District of Amsterdam. When a lady was entertaining a client, she would place these little dogs in her window to let patrons know she was otherwise engaged. A cheeky and amusing souvenir, non?

Each of these figures measure 3.25"W x 2"D x 4"H. Light surface wear is present. They may have been glazed with more detail at one point, but the details have been lost to time. Felted green bottoms.