Most expressions in Chinese about the dog, for example, "a homeless dog", "a mad dog", "a running dog" and "a dog catching a mouse", have bad meanings.

中文中关于狗的大多数表达，如“流浪狗”、“疯狗”、“走狗”和“狗抓老鼠”，都有不好的含义。

youdao

Sob pictures of a homeless dog named Yuanyuan.

催人泪下的真实照片：一只名叫缘圆的流浪狗！

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Who am I?A homeless dog getting alone at night? Joking!

我是谁，一条夜晚孤独流浪的小狗？ 开玩笑的！

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Usually you see homeless people with a dog, it's a dog that's like the guy.

NPR: Redevelopment in L.A. Affects Homeless Population

Never mind fashioning dog food in the image of a homeless man, riding the rails or a soul-food restaurant in east Little Rock.

NPR: U.S. Obesity Epidemic Hits Pets, Too