Normally, to ensure the vigor of the blood qi, it is best to use black dog blood drawn within a month; any longer and the effectiveness would diminish significantly.
Taking just the amount of a beer bottle cap each time is enough. Afterward, mix it with other substances to make something similar to red ink paste; when needed, open the ink paste lid, press with a fingertip, and then smear it on the required spot.
At this level of quantity and frequency, the impact on the dog's health is negligible. At most, give it a big chicken leg to replenish it after each blood drawing.
As for the method of raising a virgin dog, the book also records it, and it's not complicated—it's just about feeding medicine.
