1. Closer: Cats may be more dependent on their owners and become more sticky, hoping to get more attention and comfort.

2. Sniffing behavior: Cats have a keen sense of smell. They may be aware of the change of their owners and smell their owners more frequently.

3. Smell the abdomen: The cat may show special interest in the abdomen of the owner, sniffing, licking or lightly stepping on the abdomen area of the owner.

4. Guarding behavior: Cats may be more vigilant and will protect their owners, especially when the owners are in a state of rest or sleep, cats will be close to their owners and show protective behavior.

5. Change behavior: Cats may change their schedule and behavior habits, such as taking more rest or becoming quieter.