Answer:
He stayed with and accepted help from Beorn, who can change into a bear.
Explanation:
Bilbo, Gandalf, and the dwarves stay with Beorn for a few days. In that time, Beorn comes to like them due to their shared enemy (Goblins). They later left Beorn's house and traveled three days before they arrived at the edge of Mirkwood. Bilbo noticed that a bear still followed them.
