Just wondering if it's normal for a 9+ week old puppy to be skittish around louder noises. Just now I had him outside, and my neighbor about 70 yards away was hammering and he tucked-tailed and ran up to our deck. At the same time, another neighbor slammed her car door, and he jumped about a foot in the air. I'm getting worried about being gun shy, but is it just too early for this? Is it just because he's a puppy still?