If a cat is not sterilized cleanly, it means that the surgery is unsuccessful and the cat will have symptoms of estrus.

The main symptoms of cats in estrus are:

1. Decreased appetite and not eating. Cats will be more excited when they are in heat, and their minds are full of wanting to find a mate, so they will lose their appetite and stop eating.

2. I am irritable and restless and like to go out. When a female cat is in heat, the cat will become restless and like to go out. Sometimes when the owner is away, he will sneak out to find a suitable male cat for mating. Female cats will also keep rolling on the ground when they are in heat. When a male cat is in heat, his personality will also become restless, and he will sneak out to compete with other male cats for territory to consolidate his position.

3. Excited and often howling. Cats are prone to emotional disorders and excitement during the estrus period. If they cannot find a cat that can be bred, they will become anxious and howl often.

4. Female cats love to raise their buttocks, while male cats love to fight. Female cats often have their buttocks raised high and their forelimbs lying on the ground. Some male cats will mount themselves on non-estrus female cats or soft objects. Male cats in estrus will become irritable, extremely aggressive, and love to fight.

5. Female cats act coquettishly, while male cats become fierce. Female cats often nuzzle around you and act coquettishly in various ways, begging for attention. Male cats will try their best to sneak out when their owners are not paying attention and compete with other male cats for territory or fight with female cats.