My Sheltie is just a ... nervous barker. Or something. I don't know what his problem is. He barks at US. I mean, at his own family. I can walk out the back door and he barks at me. I turn right around and come back in and he barks. I mean, he can SEE that it's me! Even when I speak to him, he goes on. Every time my husband moves, it's bark bark bark. If he sneezes, he barks. I've finally started keeping the e-collar on him and been giving him a little vibration after the second bark. It's helping. But only when he's wearing the collar. He's 8 years old and we got him at 15 months. He was not well socialized.