I'm reminded of a post I saw once on another site of an extremely fat dog, the owner would feed him nothing but hot dogs. I know there is a temptation to feed your dog table scraps because your dog will beg for people food, and act very happy when they get it. The fact of the matter is, it really isn't good treatment for you dog despite how they may act. I definitely agree with many of the posts here that say this is a form of animal abuse. Even treats that are designed for dogs often recommend you only give your dog one or two of them a day, people need to be aware of that, and make sure they read the package.
I hope that most pet owners who are interested in their pets enough to come post here wouldn't treat their animals like that, but I would generally just recommend to everyone to please research a little about your dog's breed. Find out how much exercise is needed per day for their size, what is the healthiest food you can provide, and how much you should be feeding them. The result will be a happier and healthier dog in the long run!