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犬子 to describe one's own son? why?


Hello! I learned " Social credit score for China’s pet owners 文明社会 养犬规则". It was mentioned in the audio that dog “犬” is used in 犬子, one’s own son? But why? Is it to be polite or…? Is there 犬女? How do you talk about your family to others? All with animals?

Thank you!