My cat, Angel, started to get a little overweight (for her) when she was about 1 1/2 to 2 years old, and the Vet. suggested we put her on Science Diet Adult Lite cat food, which we did. She free feeds, and does not eat canned food. She is a very healthy 10 pounds now, and nobody would ever know that she started out extremely tiny and underweight (8 ounces when she was 8 weeks old!)

If I were you, I think I would ask your Vet. about Puff's ideal weight, and whether or not Puff should be put on a diet of some kind.