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If bowls stay down all day, you may not know who ate what. Timed meals make the problem visible.
Updated
Food stealing
Food stealing is a setup problem first: measure meals, separate stations, supervise timing, and protect any prescription diet.
Do not assume the stealing cat is just greedy or the other cat is just picky. Food theft can hide weight changes and medical diet problems.

If bowls stay down all day, you may not know who ate what. Timed meals make the problem visible.

Feed the fast eater behind a door, on a different surface, or with an easy slow feeder while the other cat eats calmly.

Prescription, kitten, senior, or weight-loss food should not become a shared bowl.

One cat gaining and another losing is a sign the setup is failing. Weigh portions and watch body condition.
Use tools that make portions, stations, and diet identity clearer.
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Use measured timed meals, separate stations, and supervision. Protect prescription or life-stage diets from shared access.
Measure intake and watch weight first. Sudden hunger, weight loss, thirst, vomiting, or diarrhea should go to your veterinarian.