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This is a great game and seems like using for mental stimulation may be the best application for him. Using this “find it” command around other triggers may increase the likelihood of aggressive response from him since he has food aggression.
Mental stimulation is also a way to relieve restless spirit in dogs, so you are indirectly helping his issues by giving him an activity that challenges him and that he likes to do.
Perhaps you can go a step further and teach him to find objects for you (like you keys etc,) with food as a reward. (also mental stimulation)
