I call Zulu my little barkaholic. He is an alarmist, constantly on the look out for threats. He comes running to me with that "you seriously need to check this out" look. Now that he is getting older, I have noticed that he is more tolerant of some of his earlier triggers. But sometimes I just have to get up and see what he thinks is such a threat before he will settle down. Sometimes it is annoying, but all the plusses outweighs this one issue. I just keep reminding myself he is a Sheltie, doing his job.