I remember reading somewhere that rats and wolves can be controlled by goblins to make them do their bidding. But I can't find the page I read that on, and I'm not sure if I remember it correctly now.
I'm trying to make a quest line where the PCs start off with fighting rats, and then later find out that they are controlled by goblins that live under the city. This quest is, of course, for level 1-2 players.
I have a player that's experienced and knows plenty of lore, so I'd like to know both the rules and the lore in this matter.