Basically he doesn't like dwarves but he's good mates with Gandalf who likes all the goodies and is not a big fan of Azogh (I think I spelt that right)
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Gandalf presents the dwarves in a staggered fashion while telling a story to keep Beorn's interest so he would not send them away.Gandalf wanted to keep Beorn fascinated in his story so he wouldn't notice the large number of dwarves Gandalf brought.
The dwarves are interested in (as dwarves are wont to be) tales of gold and treasure, and Beorn, having little use for these items - - he has everything he needs - - is not interested in material wealth.
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.
{| |- | 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. |}
The biggest warning was to stay on the path. Once they left the path they were lost, captured by spiders and then by the elves.