This type of behaviour may start after a change in the dogs routine or lack of socialisation/exposure to environment or as result of boredom. If your pet has developed this habit, behavioural modification or training can help to correct this activity. One method is to distract your pet away from these things using toys or showing element of surprise (squirt him with water/make unpleasant distracting noise/throw a toy near him). Giving your dog much more physical and mental stimulation prior to leaving him will quickly reduce the possibility of him looking for such things.
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