I don't recommend a shock collar for a submissive dog. It can lead to all sorts of other problems. Submissive dogs tend to be more fearful than more dominate dogs, and adding pain to correct a behavior will add to that fear. There are much better ways to correct a dog. (I am not a fan of shock collars anyway. The lower settings don't really do much and the dog quickly learns that, and the higher settings are indeed painful - while I can see something like it for a highly self destructive behavior, I know there are better ways to train a dog - and I have seen the results of both. I would not trust the behavior of a dog trained by a shock collar especially if it does not have it on - and believe me, the dog knows).
Why not contact a dog trainer in your area. Have him/her come to your house and observe your dog interact with you and the TV and that person can help you determine the best way to break your dog of barking at the tv. Ask frieds who have well trained dogs where they got their training, check on the web, etc. Avoid places like Petsmart or Petco, but if you have high end pet stores in your area, check with them. A good trainer will cost about $100 an hour, but I think an hour or two at the most, will give the trainer an idea on how to best correct this problem. It's very common.
Oh - and about NOT treating your dog - why ever not?! That is the craziest thing I have ever heard! Dogs do what works. From us, they want food and attention. To break any behavior, the easiest and fastest way is to make not performing that behavior much more rewarding than performing it. So if your puggle likes a particular treat, save it and give it to her ONLY when she does not bark at something on tv. You will have to be very consistant at first - every time she does NOT bark, reward her. After she is very consistant, start dropping the rewards to 3 out of 4 times, the 2 out of 4, then reward randomly. I still reward Jimmy randomly for certain behaviors I want him to stop (or do) and I often hear from friends and strangers that they want a dog like Jimmy as he's so well behaved.