I agree with woofgang. You have to find out why your dog is barking at night - is it because he doesn't like being left on his own when you go to bed, or is it because something/someone is near the house and he feels he's protecting you by letting you know? Personally, I don't like the idea of "anti bark" collars - it's a dog's natural instinct to bark. My dogs sometimes bark at night too, but only to let me know that there's a fox outside! Work out what the problem is first, before you go wasting your money on one of these collars, and try & solve the problem. Good luck. K