Join Date: Oct 2008
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A vet visit to check for underlying conditions, constant vigilance to break the habit, and more exercise and working games that involve fetching in order to weaken the desire.
For difficult to break habits, you have to go after the habit itself (i.e., teach a positive "leave it" command and monitor him carefully in the yard), but it really helps if you can come at whatever it is that's making the dog desire to engage in the bad habit in the first place.
For chewing, mouthing, carrying problems, I think it's an absolute must to give the dog a positive chewing, mouthing, and/or carrying job. Awesome toys that you play with together and then give him to chew would help, as would learning an appropriate fetching game together and playing it until the dog is tired, a couple of times a day.