Aw what a cutie Cleo is. Believe it or not that's what Smudge was supposed to be. As the owner of a once fat dog, I know what it can do to them. Smudge was overweight a little while ago but thanks to a strict diet and all the excercise that he gets from agility and other stuff he's now a lean mean fighting machine Well okay he could probably still lose a couple of pounsd but that will come off in time.

Here's how you can tell if you dog is the right weight other then scales of course

Standing above your dog, look down and check for a "waist" - pets at the proper weight will have a visible indentation behind their ribs.
Place both hands, palms down, lightly on your dog's ribs. You should be able to feel the ribs, but they shouldn't be sticking out.
If you cannot feel the ribs, chances are your dog is overweight. Overweight dogs also commonly have pouches of fat in the groin area between the hind legs.
If you can see the ribs, chances are your dog is underweight.