Densely covered in short soft hairs, somewhat matted. (This term has been used (incorrectly) in various ways: sometimes it seems to stand for any kind of hairyness).
Covered with not very long cottony hairs.
Densely matted with a covering of soft hairs.
Covered with densely matted hairs.
Having woolly hairs.
Woolly, that is closely covered with matted hairs.