A dog with this amount of energy needs to burn it everyday and a "walkie" is not going to take care of that . This is especially so if the dog has not been trained at a very minimum in obedience and even if he/she is obedience trained the dog needs to burn energy or this energy is going to turn into a destructive attitude.This inevitable attitude is not a result of any fault on the dog's part and there are specially designed exercises to enable the dog to burn this excess energy not only physically but mentally as well .
There are other reasons for destructive attitudes for instance the separation syndrome The separation syndrome is when a dog cannot bear to be left alone and needs in a pathological way to be with his/her owner all the time. A telltale symptom of this syndrome may be that when the owner goes to work the dog goes into a state of hysteria and becomes destructive. He does this not as a way of retribution for been left alone , but because of a lack of control which makes him unable to deal effectively with this situation.In this state of hysteria the dog not only destroys things but will urinate , defecate and resort to every conceivable mode of unreasonable behaviour . To resolve this malady we need to apply a very specific therapy for each specific case and this involves obedience training which teaches the dog amongst many other things, to gain self control over any given circumstance .