Normal. Female cats are in seasonal heat, mostly from spring to autumn, while male cats will go into heat when the female cat is in heat. The female cat's estrus is related to the degree of light. In winter, the daylight hours are short and the weather is cold, so it is normal for the female cat not to be in estrus.

Symptoms of cats in estrus:

1. Some cats like to "call spring" all the time once they are in estrus, especially at night. Extremely loud.

2. Cats like to push their butt upwards slightly when they are in heat. They also like to push their butt upwards whether they are lying down or standing. At this time, the owner can pat the cat’s buttocks to help it relieve the pain. one time.

3. Cats actually work very hard when they are in estrus, and their internal secretions are disrupted, which can cause rapid weight loss, lethargy, loss of appetite, drinking a lot of water, and frequent urination.

4. Female cats in estrus have increased behaviors such as rubbing and frequent chirping, and are slightly more active. Increased activity due to estrogen. Walking increases before ovulation, a period when estrogen concentrations rise in the body. Some cats bark like a dog. There are also male cats that imitate this sound, and female cats respond. The longest tweet can last for more than 3 minutes.

5. Some will become very clingy, while others will become very irritable and even aggressive.