I saw a huge cat today. Usually we weigh cats with a baby scale in the exam room, but this guy had to be carted to the back to the big scale. We first saw him at 13 lbs, then he has been gaining a pound a year. Last year he jumped up 3 more pounds, now weighing in at
25 pounds.
He eats a prescription diet food, low in fat and high in fiber, but its fed free choice. That's kind of like getting all-you-can-eat Jenny Craig. The owner knows she is partly (mostly?) to blame, but she wants to help him change. He's gotten so big he can't properly clean himself, and his activity level is way down. (She did note that he looks slimmer when he stands up).
We ran some labwork to make sure he doesn't have any other medical problems we need to address (like type II diabetes). If it comes back normal, he is going on a strict new diet, with weigh-ins every 2 weeks. I also gave her some weight-loss strategies for her cat, like hiding the food in tiny amounts around the house to simulate hunting behavior, getting new toys and rotating them to encourage physical activity, and switching to canned, high protein food instead of carb-packed kibble.
Unfortunately, like most Americans, pets are getting really fat. This cat is a statistic - it's mostly neutered indoor male cats that get huge. Neutered and spayed dogs are equally affected. We put our pets in our houses and feed them really calorie-dense food which they don't even have to work for. We get home from a long day at work and want to watch TV, so they sit around more, too. We've taken away their jobs and their external environmental stimulation -- they are BORED and turn to food for comfort.
I think getting dogs to lose weight is actually pretty easy. Go on walks, throw the ball, play tug of war, then reduce their caloric intake (with NO TREATS!) and presto, they lose weight. Cats are a little different. You can't cajole a cat into exercise like you can a dog. You can encourage it, but they still have to think it's their idea.
Also, indoor sedentary cats have an incredibly slow metabolic rate. You can calculate their daily caloric needs, feed them 3/4 of that, and I've seen them defy you and STILL gain weight. So you reduce the chow again, and everyone complains about the paltry amount being fed.
There are no easy answers to weight loss, not even in veterinary medicine, and we don't even have all the food-emotional issues that humans struggle with. I am hopeful for this cat, though. If we can just get him down to 18 pounds, he will have a much better quality, and statistically longer quantity, of life.