There are many sentences about people being poorer than dogs. Let me share some with you:

A poor person is not as good as a dog, and his heart is Goodness is worse than gold.

A poor man is not as good as a dog, but his talent can reach the sky.

A man is poorer than a dog, and his virtue is wider than the earth.

A poor man is worse than a dog, and his family and everything will be prosperous.

A poor person is worse than a dog, and he will be blessed if he studies hard.