The reasons why unneutered adult male cats cannot be kept together: 1. Unneutered male cats will compete for territory when they are in heat, and fights can easily occur, resulting in injuries to the cats. 2. If two cats live together, one cat may cause additional stress and discomfort to the other cat. 3. Prevent cats from infecting each other when they are sick.

Notes on raising two cats at the same time:

1. At least make sure that each cat has a cat nest, water bowl, food bowl, and cat litter box There should also be two or even three or more.

2. If it is a male cat, the adult male cat should be sterilized to prevent fighting between the two cats during the estrus period.

3. Treat both cats equally. Cats are very jealous. If the owner is only kind to one cat, the other cat may beat the cat out of jealousy.

4. Pay attention to disease prevention and isolation. When one cat becomes sick, isolate it immediately to prevent it from being transmitted to the other cat.

5. If two cats fight, the owner needs to stop it in time to avoid serious consequences.