This is the 827th most frequent Chinese word.
狗
Dog.
Here, '狗'(gǒu) is used metaphorically to describe someone's servile nature, conveying a sense of humility or lack of dignity.
他的性格很狗，总是低声下气地讨好别人。
His personality is very servile, always trying to please others obsequiously.
In this colloquial expression, '狗'(gǒu) is part of a simile, often used to emphasize an extreme state or condition.
天气热得像狗一样。
The weather is as hot as a dog.
In this sentence, '狗'(gǒu) directly refers to a domestic dog, specifically a puppy, showing its usage as a noun.