The reasons why a male cat’s urine suddenly smells bad:

1. When a male cat reaches estrus, the secretion of hormones in the body causes the urine to become concentrated, causing abnormal odors. If there is a bad smell, you can wait until the estrus period is over and take it for sterilization.

2. When a cat suffers from urinary system diseases, it will cause oliguria and the fishy smell of urine will become worse. The cat needs to be taken to the pet hospital for treatment in time.
3. When a cat eats too salty or too greasy food and gets angry, it will also cause the urine to be very smelly, so the cat needs to be given a light diet.
Precautions for cats in estrus:
1. Cats are in estrus and their resistance will decrease. They need to supplement nutrition and feed them more nutritious food.
2. When your cat is in estrus, you should also take measures to keep it warm to avoid catching a cold.
3. After a cat is in heat, it will want to find the opposite sex to mate. The owner needs to close the doors and windows to prevent the cat from slipping out.