According to traditions he used to get his nails pared either on Friday or on Thursday in the following order:
Right hand: forefinger, middle finger, ring finger and little finger.
Left hand: little finger, ring finger, middle finger, forefinger thumb and right thumb.
In getting the nails of his feet pared, the Holy Prophet observed the following order:
Right foot: beginning with the little toe to the great toe successively.
Left foot: beginning with the right toe to the little one successively.
The Holy Prophet (Sallallahu Alaihi Wa Sallam) used to get his nails pared every fifteenth day. [Shamail-e-Tirmizi]