When I bought my guinea pigs, I were told they were sister. But I then learned they were infact brother and sister. So now I have them seperated, there cages sid by side. They both have plenty of toys and chew toys, but they never chew them.... -.- I fill them with hay, and food, and whatever, and not even a dent. Is this ok? I mean, shouldn't they be teething or something?!?!?(Their not babies though)