Signs a cat dislikes another cat:
1. Because cats that dislike another cat will not allow a new cat into their territory.
2. When cats dislike another cat, they will not eat together and may even fight.
3. When a cat dislikes another cat, it will be hostile towards it, and may even ostracize it, prevent it from getting close to itself and its owner, quarrel, fight, snatch food, and destroy the other cat's food bowl, supplies, and toys.
4. Cats will ignore their owners and become indifferent and distant. When a new family member is welcomed, whether it is a kitten or a puppy, the cat will obviously exclude the other party and therefore attack, trying to get the owner's attention and more care. 
How to get two cats that dislike each other to live together peacefully:
1. After bringing the new cat home, immediately place it in the prepared area. Do not let the two cats stay together. Do not linger there for long. Spend more time with the original cat and do not visit the new cat for the time being. Give it some time to adapt to the new environment.
2. After a period of time, allow the new cat and the original cat to have limited contact. It is best to separate them through a glass door, so that they can see each other but not touch. Alternatively, you can leave the door to the isolation area slightly ajar so that they can touch noses and wave paws, but there should be no large-scale contact.
3. When unrelated cats meet, they will often be hostile at first, growling at each other. Do not interfere or force them; let them resolve things on their own. After one to three days, the cats will sniff each other's tails and press their noses together to confirm each other's presence. Unless they are extremely incompatible, they will usually establish a pattern of interaction and communication within a week.
4. Because there's an unspoken rule in the cat world that the first cat to arrive is the alpha, owners should never neglect their original cat. If the original cat is neglected, it might affect its relationship with the new cat. A fundamental principle owners must adhere to is to avoid unequal treatment.
5. Feed them separately; do not share a bowl with multiple cats to avoid competition for food and increased tension between them. You can bathe the kitten once with the same shampoo used on the older cat to help it smell more like its parent cat.
