If you think or know they will be setting them off even more on New Years you might try buying some Rescue Remedy at a health food store. A few drops of that on the tongue of my dogs who hated fireworks seemed to calm them down. After lightening struck and burned our home 9 years ago they then became obsessed with the smoke alarms in the house. They would go out into their yard and stare up at the roof to see if it was burning as it was in the fire. Even the buzzer on the oven would set them off.