How to get my cat to eat on schedule when another cat steals food?

Unfortunately the best option would be to either separate the cats so that the food can be somewhere where one cat can get to it but the other can't, or to utilize a timed feeder so that small amounts of food can be given out at a time, allowing both cats to eat without overindulging. Once your new cat is a little more calm and comfortable, he may gradually start to limit his intake as well.

There are only two ways you can control this. The first is to separate them during feeding times, offer multiple feeding times in a day and not to leave food down to free feed. The second option is to purchase one of the specialized automatic feeders with the individual collars. Each cat will wear it’s own special collar and when it approaches the feeder, the feeder will read the collar and dispense food or not. Best of luck.

Start feeding them separately and measure their food. Divide the total amount your cat should have per day and split it into two, three or more meals, depending on your schedule so she doesn't have to go too many hours between meals. Check the label on your cat food for feeding recommendations for your cat's weight or, if you haven't yet done this, make an appointment with your vet for an evaluation and a prescription diet and weight loss plan. Feed one cat in one room, shut them in and feed the other cat at the other end of the house, or upstairs if you have a two-story home. Depending on how food motivated your cat is, you can get her to follow you around the house a few laps before putting her food down for her. If she likes to play, take some time to play with her every day, using a wand toy or a ball she can chase and swat around. Drag a toy on a string for her to chase as you walk around the house, anything to get her moving and active.

Divide the daily allotment into two equal portions. Put their food down in the morning in separate rooms so they can't eat each other's food. Leave the food down for 30 minutes, giving them a chance to eat. After that time, pick the food up. Feed them again in the evening, again giving them 30 minutes to eat. They will learn to eat at those allotted times. Best of luck.

Try warming it slightly or mixing in a teaspoon of baby food. If Leelee will allow, check her mouth and teeth for signs of periodontal disease (redness, bleeding, swollen gums, loose teeth, bad breath, etc). See your veterinarian for an exam if necessary or if she doesn't eat for more than 2 days. If she has significant periodontal disease, she may need a dental cleaning. If the decreased appetite has another cause, a physical exam and blood work may diagnose it.

I would start all of them on a feeding schedule, and feed her separate from the other cats. When they are done eating, put the food away. That will help her lose weight. Good on your for wanting to do that!

I suggest you go to meal feeding and separate the cats when they eat. One cat in one room. One in another with the door closed. ( https://www.pet-happy.com/how-to-start-scheduling-your-cats-meals/? )