Methods to make the old cat accept the new cat:

1. Separate the supplies of the new cat and the old cat and keep them separately for a period of time.

2. You can also make the old cat accept the new cat by playing games or rewarding snacks, allowing them to interact more to enhance their relationship.

3. You can also place the new cat’s belongings next to the old cat, so that the old cat can gradually become familiar with the new cat’s smell and accept the new cat.

The reasons why new cats do not accept old cats:

1. Because cats have a very strong sense of territory. When a new cat enters, they think their territory is being violated. Violation leads to rejection.

2. It is also possible that the cat is very jealous and does not want the owner to treat the new cat well, so it rejects the new cat.

3. It is also possible that the cat itself has a very bad temper and wants to attack other new cats when it comes into contact with them.