The Puppy Bloodless Tail Docker blocks the blood circulation to the portion of the tail to be cut off. The tissue that needs to be cut off will become necrotic and  fall off naturally. This clip can be used to cut off the tails of newborn puppies whose breed requirements call for tail docking. The tail docking should be done within 3 days to 10 days after birth. Older puppies should be surgically tail- docked.

The process is slightly painful, but the puppy will be fine as the pain is transient. You need to just insert the rubber band over the clip and then place the tail. Drop the rubber band on the tail at the point stipulated by your breed standard.  That is the point where the tail will be cut off. The tail will  cut off within 3-10 days after application. For example, a Welsh Corgi is tailless, so the rubber band should be placed to clean off the tail completely.