Our 8 month old springer doesn't really bark much, but has just started to in certain situations. It's excitement for him I think, and totally understandable as it's mainly when the cat tries to come through the cat flap or like today when the window cleaner was outside. He's wagging his tail when barking, doesn't seem cross or frightened. He stopped when the window cleaner was out of sight, but found it hard to focus on me - he did lie down when asked, but would then stand up and bark.
As I said, I think I understand why he's barking, know that barking is 'normal' and fine, but would like to know if there's anything I should be doing.