What is tail docking - CDB
https://www.cdb.org/what_is.htmThey are the first digit on a dog, and, unlike digits 2,3,4 and 5, are not used for walking. They are located a short distance up the leg on the inside surface. They are usually removed at the same time the tail is docked, at 2 to 5 days of age. At this age, the bones that make up the toes are tiny and soft so that snipping them off is easy.