I think it comes down primarily to portion size. And yes, some dogs “do better” on higher protein, lower carbs, etc.; so, yes, it’s also about finding the combination of nutrients that works for your dog. If you cut your current portion, you might see some better results. Remember to include the “extras” in their total daily intake. Especially with smaller dogs, it’s easy to overfeed.
You didn’t mention whether or not you were a kibble feeder, but currently I’m feeding this to my Cavalier, who is a notorious little piggy and gains weight very easily: http://www.wellnesspetfood.com/product-details.aspx?pet=dog&pid=93
I’ve had great success with the Wellness Small Breed Complete Health Healthy Weight. My Arabella has lost the weight finally! This food has fewer calories than a lot of the high quality foods that you might have been feeding.
