My Sam weighs close to 17 pounds, but he just looks barrel-chested. He could stand to lose 2 pounds and would look great. I was worried, but the vet wasn't. Sam is an inch taller in the shoulders than Jane or Spunky who weigh 11lbs and 10 lbs respectively.

I use grain free food to keep their weight down. No Corn or wheat. Spunky and Jane both romp around the house with each other, but I have to make Sam play and run.