Learn to listen to dogs barking in your area, your own dogs included. You will start to differentiate between the irritating “keffertjie” who just barks at the moon and something more serious. If you hear dogs barking, inspect. This will help you learn whether it is a person, another dog or nothing at all. But 95% of the time something does bother the animals. Listen to your own dogs. If you pay close attention to their body language and way of barking, they will direct you to the problem. As statistics show that most intruders are not really deterred by dogs, dogs can still be an early warning system.