Choosing yin is very particular. It is very difficult to choose a good place to hide wind and gather gas. It's hard to find a good place. Why defile it with dog blood? Are you out of the aura or treasure? Black dog blood is used to ward off evil spirits. In superstitious terms, the Yin House itself is the place where the ancestors laid the bodies. It's like playing with dog blood. It's heresy. The above is my personal opinion.
Yishanliangdong