We have two cats. CoCo and Chanel (I know, how gay!). Last year Chanel had become very sick. Now he had always been a chubby cat, but he had gotten really big. He couldn't run or jump. He would cry in pain if you picked him up. We always thought it was because he was so fat. Putting him on a diet was impossible because CoCo would get bladder infections from the diet food. Forget feeding them separately, we were never home to do that at the time. Well, like I said Chanel started to get really sick. It got to the point that he was throwing up all the time. He developed a fever. Richard got him to the vet. It turns out that because of his size his digestion system was not working properly. He was severely constipated and could not go number two. That's why he was throwing up. The food had nowhere else to go. So they had to go in and clear him out. (sorry, I told you it was gross, but it saved his little life). He was placed on a permanent laxative. So after he recuperated the vet said he would need exercise. An hour a day. How do you exercise a cat that has always been a lazy indoor cat. Well, to start, Richard brought him out to the hallways of our apartments. He was so afraid to be outside! Only when he was carried away from our door would he move, and that was to hurry back and try to get inside! So each day Richard would take him a little farther... Almost a year later Chanel has adjusted to his walks! They walk around the nearby park for an hour 4-5 times a week. Chanel has lost a lot of weight. He runs, jumps on the counter, plays in the sink... It's like having a kitten. A really big clumsy kitten.