Will dog blood make the door full of bad luck?

It is a superstition that dog blood makes the door full of bad luck, and there is no scientific basis.

Feudal superstition refers to blindly believing in and following old customs or traditions, rather than judging according to facts and reason. This kind of behavior is unscientific and may have a negative impact on individuals and society.

We should respect and abide by science, not blindly believe in and follow old customs or traditions, but make judgments based on facts and reason.