Noir? I guess so...
First of all, noir requires certain qualities. Black and white does not make a certain piece film noir. There are just certain regulations that you have followed but they are not so clear. -Film noir is all about the bluring of clearity so you did so wonderfully! So is the pet owner the protagonist, the house fly the femme fatale, and the ending disaster is she sucks his life out? I guess it is film noir. You should have elaborated on the plot.