I used to shoot at night on my college campus, using ASA 64 Kodachrome slide film, at f/8, and typical exposures of 30 seconds in well-lighted areas, and as long as 2 mins and 30 seconds for dark areas that had no street lights or building lights. I would use a flash to illuminate people, with the exposure determined by how far away the person was from the flash, in relation to f/8 aperture value.
You could try a similar approach; it has the value of what KmH is talking about...the background is fairly dark, so it LOOKS LIKE night time, but the subjects who are close to the camera, have been lighted by a flash pop. One tip is to put the people in front of a DARK area--you do not want background lights in the area where you will have the people positioned. With a 30-second exposure time, you have plenty of time to work with, so the people can come in, and pose and then you can do a flash pop. If you want to, you can have them move over a bit, and receive a second flash exposure.
I would try this, the timed exposure for the scene,and then the woman and dog illuminated by a flash pop. One of the keys to shooting at night is being able to gauge exposure; shooting at f/8 makes that easier than jumping around between f/stops.