Guinea pigs need to chew on stuff constantly to keep our teeth healthy. Did you know that in Iceland, guinea pigs are called "naggrís", which means "gnawing pig"? It's true. That's why we love the Ecotrition brand Snak Shak. It looks like a tiki hut and it's safe for pigs to gnaw on. It serves the dual functions of giving us a place to hide while also allowing us to nibble on it and keep our teeth healthy. The only issue I have with it is that the first ingredient is pine wood shavings, which isn't really the best thing a guinea pig could eat. Still, we only end up ingesting a small amount, so it's still fairly safe. I give it 4/5 stars.
Best of all, unlike plastic igloos, Lola isn't strong enough to knock it over, so I always have a place to hide!