It can sound like a kennel in our house...especially if someone rings the door bell or if they hear the UPS/Fed Ex truck. Kissy will start them all barking if she hears something. I pop a rolled up newspaper on my hand and they generally shut up. I used to use a metal can with pennies but they got too used to that and it didn't phase them.
When they all run outside to potty, they are barking their brains out and can't get out fast enough!