Stress. The most common reason dogs develop sudden destructive tendencies is due to stress.
Why is my older dog suddenly destructive?
If you noticed your older dog chewing suddenly, this is another dog behavior signaling that something may be wrong. There may be a sudden increase in boredom, new or returning separation anxiety, pain, or it could just be age-related.
How do you fix destructive behavior in dogs?
Put valuable objects away until you're confident that your dog's chewing behavior is restricted to appropriate items. Keep shoes and clothing in a closed closest, dirty laundry in a hamper and books on shelves. Make it easy for your dog to succeed. Provide your dog with plenty of his own toys and inedible chew bones.
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