I came across this video and it really makes you think twice about having so much faith in whether that dog you feed daily and rely on to protect your home or your family would actually step up and do it, or would they run away or just lick the bad guy.
http://www.newson6.com/story/20049010/would-your-dog-protect-you-from-an-intruder
http://www.newson6.com/story/20049010/would-your-dog-protect-you-from-an-intruder