Lily barks at every little thing she hears, but I definitely know her bark. Her "I hear a strange noise outside bark" is a little half bark/growl type of deal and then if someone's barging in the house or she thinks there's going to be an intruder, it's Pomeranian Yap Patrol barkfest . She also barks in her sleep. It's a little yip with a bit of a growl