Oh wow!!! That is one big kitty!
Our cats are both small, but both a bit overweight, too. They both hover around 12 pounds, but probably should be around 9-10. One is long and (should be) lean, with alot of oriental in her. The other is just kind of squat and compact. Her little belly swishes back and forth when she runs. We are switching them both to a new Purina food that is hairball control and weight management in one. They both really like it and seem to have lost a little weight.
We once figured the cylindrical volume of my cat.. and compared that to her rectangular solid volume.
The difference wasn't that big.
*chuckle*
Kearen started out nice trim and thin, but then we had her fixed.
Then she became a large.. Helga the Valkyrie opera singer..