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. Pet Health Problems Pro 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.
The 6 leanest types of high-quality protein for building muscle (not what you think!), so your dog can be powerful but lean.