the type of food given has a direct bearing on the tendency of a dog to become overweight. table scraps, treats, and even premium high-energy dog foods can contribute to obesity. therefore, it is highly important to closely monitor the quantity of treats that a dog gets especially when the dog's activity is diminished. dog treats are more likely to be linked to obesity in old dogs, since in their old age they are less likely to be active and exercising. active dogs require and use more calories.