Twenty-five to 40 percent of dogs are overweight. Many times the owners aren’t aware of it until it’s diagnosed by a veterinarian. All dogs are different–different breeds have different weight requirements, and even within the same breed, weight standards can fluctuate. Sometimes even a veterinarian can have a hard time telling if the dog is overweight. There are many reasons why a dog might have a weight problem; lack of exercise, high calorie treats and health problems are just a few. Making low-fat dog food can help your pet live a healthy, longer life.