Puppy Electrocuted After Chasing Screwdriver

by Neko
(Ohio, USA)

I remember watching a late 70's or early 80's movie about a man and a woman trapped inside a room with one wall exposed to the outside. They are afraid to go outside.

There's a puppy with them and when the woman throws a screwdriver through the opening the puppy chases it. When he comes back with the tool he's electrocuted trying to re-enter the room.

I remember being horrified by the fried puppy, but I was so young, I can't remember anything else about the movie.

Any ideas?