The Dorian Scale.

The dorian mode is the second mode of the major scale, in other words, playing the dorian is the same as playing a major scale starting at the second note.

The finger pattern for the dorian mode is as follows;

In this example we are playing the F# dorian scale, starting at the 2nd fret of the 6th (low E) string.
Note that from the fifth sting down, this pattern is identical to the mixolydian pattern that we learned previously.
The note marked in red shows the beginning of the relevant major scale.

Black Notes: These positions should be fretted with the first finger.
Blue Notes: These positions should be fretted with the second finger.
Green Notes: These positions should be fretted with the third finger.
White Notes: These positions should be fretted with the fourth finger.