
Separate habit from appetite
Some cats beg because the routine predicts attention or treats. A cat who approaches food but cannot eat may be telling you something different.
Updated
Appetite behavior
Begging then walking away can mean expectation, stale food, texture dislike, stress, nausea, or mouth discomfort.
Do not dismiss it as drama if the pattern is new. Check the easy food and setup problems, then treat repeated walk-aways as appetite information.

Some cats beg because the routine predicts attention or treats. A cat who approaches food but cannot eat may be telling you something different.

Stale kibble, cold wet food, a dirty dish, a deep bowl, or another pet nearby can make the cat ask and then leave.

Offer a small amount of familiar food in a clean dish in a quiet spot. Do not keep opening new foods all day.

Repeated walk-aways, vomiting, drooling, hiding, weight loss, pain, or refusal of familiar food should move the question to your veterinarian.
Use tools that make fresh portions, notes, and bowl comfort easier.
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The cat may want attention or treats, but repeated walk-aways can also point to stale food, stress, nausea, mouth pain, or illness.
Call for repeated refusal, vomiting, drooling, hiding, weight loss, pain, weakness, or a sudden change from normal appetite.