Because he could change shape from a great black bear, to a large man, at will.
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Beorn is a skin changer in The Hobbit.
Someone that can change from human form into something else. In The Hobbit Beorn was a shapeshifter and could turn into a bear.
A goblin's head that was stuck outside the gate and the skin of a warg nailed to a tree.
{| |- | Beorn was off checking up on the story that Gandalf and the dwarves had told him. He returned and told them that he had confirmed the story. Beorn captured a warg and a goblin and after getting information from them he killed them. The warg's skin and the goblin's were mounted on the wall. |}
They enter in pairs because Gandalf tells them to do it. They don't want to go in all at once, so Beorn will think they were trying to kill him The dwarves must enter Beorn's house in pairs so that, as Gandalf tells their tale to Beorn, each entrance does not seem very imposing and Beorn's interest in the story is built up. Then the group will be able to stay with Beorn.