Hi. I have a 3yr old black and white female kitty, she was a stray that had kittens in my front yard. After she was spayed she started to slowly gain weight regardless of her diet. Her kittens were adopted, and I've been updated on their progress and they too are very large. She had all kinds of blood work done, especially for thyroid dysfunction and everything came back normal, even an ultrasound. My vet thinks she might have true obesity, which apparently is genetic. I guess it's not very much studied in cats. Im wondering if anyone has any experience with it in their cats, or even dogs ? She is on a very strict diet but it doesn't make a bit of difference. It's very strange because before she was spayed she was not overweight, she looked healthy. She never lost weight from feeding her kittens unlike my Foster cat who lost a good bit of weight while nursing hers. If anyone has any experience with feline obesity I'd appreciate any advice you could give