Mlokowy Smij
The Mlokowy Smij is a form of dragon from Lithuanian myth. They are good-natured and give milk to those they like, often women of high status.
Citations:
Grimm, Jacob. Teutonic Mythology. United Kingdom, George Bell, 1883.
MacKenzie, Shawn. Dragons for Beginners: Ancient Creatures in a Modern World. United States, Llewellyn Worldwide, Limited, 2012.