We have our gorgeous (retired courser) hound since August. He settled with us quickly but over the Christmas break he really found his feet at home with us all there all the time. He also discovered barking. And now he won't stop. 
The barking is mostly when we are standing waiting for the dc at school pick up. In the last week, he's been barking for no apparent reason, having been perfectly quiet before the holidays. We stand well back from the throng (big green waiting area) but the last few days when he has seen a dog close to his size or bigger than him, he'll "shout" at them. The barks don't seem to be aggressive and he's not in either a threatened or threatening posture when barking (ears cocked but not pricked and relaxed wagging tail). I'm just not sure what to make of it. He's a big dog, definitely on the bigger end of the greyhound range, so some parents with smaller dogs are understandably wary of him when he starts up. I hold him close, stroking his neck, talking to him and holding his collar, just in case, but he hasn't made a move towards the other dogs either time, it just seems like he's letting him know he's there. I was wondering if the more experienced hound owners have any insight I'm missing?