Cats do not feel guilt or remorse like humans do, but they can still acknowledge when their humans are upset and take steps to apologize.
Cats are excellent at reading vocal tones, facial expressions, and body language, so they know when their humans are upset.
When a cat does something that upsets their human and receives a negative reaction, they are likely to remember it and base their future actions on it.
Cats apologize to maintain social structures and order in their world, as social interaction is important to them.
A cat's apology may include behaviors such as giving space, staring, avoiding eye contact, initiating physical contact, purring or meowing softly, and bringing toys for playtime.