While keeping resolutions may be a losing battle for us weak humans, it may be easier for you to keep them when they relate to your pet's health. Studies say that about half of dogs and cats are overweight or obese, which can result diabetes, respiratory disease, kidney disease, and other ailments including hip dysplasia.

Steven Budsberg, director of clinical research at the University of Georgia College of Veterinary Medicine, told the Wall Street Journal last year, "Obesity in pets is almost the equivalent of smoking in human medicine. There's the high cost to people, and it's self-induced. I never met a German shepherd who could open the refrigerator or food bag and pour himself another bowl."

Here's a chart with what an ideal weight pet should look like. Here are tips on how to control your desire to give kitty treats and how to change your behavior to get Fido healthier.