Do chi's eventually outgrow chewing things? When I catch them in the act, they run away, so they know they're naughty. Because of their chewing (they have chewed wallpaper quite a few times, aaaargh), I cage them when they are home alone, and they even chew the pee mat in the cage. I can't hide treats as one is dominant when it comes to food and I don't want them fighting when I'm not there just in case. One is 14mths, the other is 23mths, both male.