狗崽子 literally means 'puppy' or 'whelp', but it is far more commonly used as a vicious insult equivalent to 'son of a bitch'. During the Cultural Revolution, it was a political slur directed at children of landlords, capitalists, and other 'bad' class backgrounds, carrying heavy historical baggage. The literal sense is rare in modern Chinese (小狗 is the usual word for puppy), so learners should be aware of the word's strong derogatory and political connotations.