Well, 3. Ever. But the one he barked at today was a 12 year old boy. It was an alarm sort of bark rather than aggressive. He kept looking at me, then the boy, then barking. Boy has a dog so was unfazed, but obviously this is not desirable behaviour. Dog stopped barking when the boy went upstairs but chuffed when he returned. He did then approach the boy with wagging bum for a sniff, but kept backing off chuffing. What's that all about? And how do I stop it?