I Married a Monster from Outer Space

In this 1958 sci-fi horror film, Marge Farrell (Gloria Talbott) begins to suspect her husband Bill (Tom Tryon) is not the man she married, and discovers he's actually an alien humanoid. As she delves deeper, she realizes other husbands in their social circle are acting the same way, all being taken over by alien impostors. With the help of her doctor and a posse of men who recently fathered children, Marge convinces them to attack the aliens in their hidden spaceship, using German Shepherds as a key to their defeat.