Even for our pets, losing weight isn't easy. To slim down a plus-size puppy, you must do away with table scraps and significantly increase her running or walking time. But more help is on the way: The [US] FDA recently approved Slentrol, the first canine diet drug. The prescription drops are administered once a day, either directly into the mouth or with food, and work by suppressing appetite and fat absorption.

It's no quick fix, however: Dogs typically have to take the drug for six to ten months, and follow a diet and exercise program, to see results. Weight loss will differ form pooch to pooch. Slentrol is recommended for dogs that are at least 20% over their ideal weight. (And don't try it yourself or give it to a fat cat.)

Fancis A. Kallfelz, a professor of veterinary nutrition, is taking a wait-and-see approach with the drug but says initial data look promising. Slentrol will be available soon. Meanwhile, it's not too early to cut the treats, grab the leash and get moving -- it'll do you both good.