Stop using commercial dog food as your dog's only or main source of food. This step is the most important and you should make the change in the next couple of days. But you can't make this change unless you have a good alternative plan in place. Perfect Dog Puppy Training can show you a proven alternative plan, it's much easier than you think and much cheaper than you're spending now. I'll get to that very soon.
Know in 1 second how many calories your dog should be eating every day with my At-A-Glance Body-Weight-Calorie-Chart.