Most aggressive cats exhibit aggressive behavior because they have experienced some form of pain. For cats with persistent aggressive behavior, corrective treatment is necessary. Undoubtedly, their aggressive behavior can be seen as hostility towards other cats, dogs, or even humans. Such cats are often neurotic. 
If your cat exhibits aggressive behavior, you may want to consider these tips:
1. If it's a lonely old cat, consider getting a kitten to keep it company. An old cat and a kitten are more likely to accept each other. However, it's important that the kitten is brought home by someone the old cat doesn't know at all. This is to prevent the old cat from associating you with the kitten and becoming jealous.
2. If the older cat is hostile towards the kitten, try calling the kitten "the older cat's kitten," as this can create a positive connection between them. Secondly, when talking to the kitten, also talk to the older cat at the same time to engage the older cat and encourage normal contact between them, thus fostering a bond between them.
3. If your cat is particularly nervous around someone, try referring to that person as "the cat's person," such as "This is Lily the cat, and this is Lily's cat." This connects them. This will dispel the cat's nervousness and anxiety towards that person, but you'll need to practice repeatedly.
4. Cats are easily affected by their owners' emotions. As the owner, you should do more stress-reducing exercises and activities to help both you and your cat relax.
5. Some owners take their cats to the vet to use sedatives to control their emotions, but simply using sedatives is only a temporary solution. To be effective, the cat's behavior must be rebuilt and sedatives used in conjunction with sedatives. This will help reduce the cat's aggressive behavior.
6. Music can also relax cats and reduce their aggressive behavior. Therefore, you can play soft background music to soothe your cat.
7. When a cat feels nervous, it will naturally use its claws to attack its enemy. Therefore, you should trim your cat's nails regularly. When trimming, it is best for another person to hold the cat and distract it.
In summary, most aggressive behaviors in cats are caused by emotional stimulation, so owners should avoid anything that might affect their cat's mood.
