It talks about why the handler should be the one feeding treats to a shy/nervous dog, not the stranger. Help a girl out and link it! (Please)
• Caution! A fearful dog may temporarily overcome his fears in the tempting presence of a high value treat, then bite the scary person when the treat is no longer there. Don’t have strangers/helpers feed treats until you are sure your dog has been desensitized adequately – that he no longer appears fearful when approaching or being approached by strangers.