A lot of the time it is extra pent up energy causing them to tear things up, if they are destroying beds and such. As for destroying toys I just got better at selecting one that will last. I never buy stuffed toys because if they never last more than 15 minutes, and usually it is between 5-10 minutes. I go for toys made by Kong and JW Pet. They seem to last the longest for us. My girl is 8.5 and will still tear up something if it is not well made. My other two lived past 10 and would chew up toys that weren't well made.