Cats who are closely related cannot reproduce. Because the DNA of close relatives is similar, it is easy to breed cats with stunted development, deformities, or defects, and inbreeding cannot improve cat breeds. Inbreeding does not necessarily lead to deformities or defects, but the probability of them will be much higher than the offspring of unrelated cats. In order to avoid unnecessary trouble, it is best not to allow cats to inbreed.

Methods to avoid inbreeding of cats:

1. Raise them separately. When cats reach adulthood and before they experience their first estrus, cats of different genders should be kept separately to prevent this kind of inbreeding.

2. Find a suitable spouse. When a cat is in estrus, you can arrange a suitable partner for the cat to help the cat survive the estrus period.

3. Sterilization. If you don’t want your cat to breed, it’s best to isolate it during the estrus period and neuter it at the appropriate age.

4. Play with others. When a cat is in heat, the owner can spend more time with the cat, play some small games with it, or divert the cat's attention.