The Pet's Observation Porthole.

This clear acrylic dome opens a window to the world that helps satisfy a pet's natural curiosity while maintaining safety and security. The porthole mounts easily over a hole cut into the fence and the 9 1/2" diam. dome protrudes 5" to give an inquisitive canine a panoramic view of the world beyond. The black plastic flange secures the porthole into any style of wood privacy fence. Spacing several portholes along the fence gives your pet an unfettered view of its surroundings and may help reduce barking or other undesirable behaviors. 12 1/2" Diam. x 5" D. (3 lbs.)