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At my house, they could break in if they really wanted to, but then they have to get past Jacob. Jacob is 85 lbs of GSD without any sense of humor at all when it comes to a stranger in his home uninvited. The sound he makes will raise the hair on your neck.

Check your deadbolt installations on your doors. A young woman's home was easily broken into because the deadbolt on her door was not installed correctly. It did not allow the bolt to slide all the way to the fully extended point at which it would "lock". The slimebags easily slid it back using a flat tool.
The video shows how to double check your deadbolts to make sure they really are locking. Needless to say, the young woman in the story should consider learning to handle a gun to defend herself in the event the next guy just breaks the glass and she is home.

http://dfw.cbslocal.com/2012/09/25/fron ... maybe-not/