My guinea pigs are having a blast at the moment ... I've blocked off just one area (under my bed, I'd never get them out) and the rest of the room is theirs to explore. There are no wires so it's safe. I've put out their cardboard boxes and litter tray, and a fleece throw, in the hope that they would "go" on the fleece or tray rather than my carpet, but I can already see that they have left me some presents in a corner where they think I can't see them.