Why is it that our potentially playful experiences have all too often been turned into attempted escapes from tension or boredom, or beyond that, into exercises geared to accomplish something? (religion-online.org)
Some dogs exhibit what has been called barrier frustration, in which they become destructive and attempt escape simply in response to being confined. (vin.com)
Some dogs exhibit what has been called «barrier frustration» where they become destructive and attempt escape simply in response to being confined. (marvistavet.com)