Here are a couple of articles to help you target your dog’s ideal weight and estimate the proper serving size based on calories which you can get from the bag of your dog’s food and treats. A study suggests that Dogs fed to ideal body condition lived 1.8 years longer than their overweight litter mates
Dog Food Calculator: http://www.dogfoodadvisor.com/dog-feeding-tips/dog-food-calculator/
Determining ideal body weight: http://www.dogfoodadvisor.com/dog-feeding-tips/dog-ideal-weight/
