you should get him to a vet, dogs have veins and nerves in their nails and it's possible one of these has been cut. i wouldn't suggest removing the nail yourself
nail root
root
Holds The root and matrix of the nail
This is called the nail matrix.
The root of the nail is located beneath the skin at the base of the nail, where keratinized cells grow and push out to form the visible nail plate. This area is known as the nail matrix, which is responsible for producing new nail cells.
haha do you take anatomy? nail bed im thinking
i belive it is the nail root.
Would be the nail root, because it is the potion of the nail that is buried in a fold of skin.
The extent of the germinal matrix of the nail, lies beneath the nail fold, extends beneath the nail root and generates nail tissue.
Nails grow from an area of rapidly dividing cells known as the nail root. The nail root is located at the tips of fingers and toes. During cell division, the cells of the nail root fill with keratin and produce a tough, platelike nail that covers and protects the tips of fingers and toes.
Tap root.