Cats usually start to go into estrus when they are about 6 to 8 months old, and each time lasts for 3 to 7 days. If they do not mate, they will go into estrus again about 1 to 4 weeks apart. When cats are in heat, they will howl, urinate, become anxious, and want to run away from home. Therefore, you need to take good care of the cat. If you don’t want the cat to have children, you can take the cat for sterilization surgery. This can relieve the discomfort of the cat when it is in heat, and also Can extend the life of cats.