New York Style Shutter Hinge. 2-1/4" Offset, sold per pair. Rustic antique design crafted in solid bronze for maximum weather resistance when exposed to the elements. Each design is a careful reproduction of an antique design with excellent detail. In engineering, a dog is a tool or part of a tool that prevents movement or imparts movement by offering physical obstruction or engagement of some kind. It may hold another object in place by blocking it, clamping it, or otherwise obstructing its movement. So a "Shutter Dog" is a stay that holds a shutter in place. These are traditionally used on the exterior of a house to hold a shutter open. They are historically found in a variety of shapes including grapes, shells, "S" shapes, and "rat-tails" among others.