A superb design by the incomparable Ms. Claire.

Fingering yarn double.

Clarification:
Head Sides:
R 39 & 40: cast on 7 st at beginning of next two rows. (29 st)

In other words:
R 39: cast on 7. Knit these 7 stitches and continue to knit to the end of the row. (22)
R 40: cast on 7. Purl these 7 and purl to the end of the row. (29)

Errata:
Left Hind Leg:
pattern states:
r 61: k19, skpo, k5, k2tog, k15 st to end.
correction:
r 61: k18, skpo, k5, k2tog, k18 to end.