When you have a dog for a few years, and she reaches the mellow middle age of 4, you start to think she's finally over those pesky behavior problems she exhibited as a young dog. You think she sleeps most of the day when you're at work, and just calmly awaits your return. After all, you walk her in the morning and again when you get home, and give her treats and attention in the evening. Surely, she wouldn't feel the need to tear into something soft and squishy some day.
But you'd be wrong.