When Deisel was a puppy he was terrified of the dark. He would not go outside in the dark, so we had to buy 2 spot lights and put them in the backyard for him. I would have to go out with him and even then unless there was lots of light he would just sit right beside me (almost on my lap) and wouldn't move.

Now as he is older, he isn't afraid of the dark (or anything for that matter). I think it just has something to do with them being a (kid).

If you know that the pup was taken care of and not mistreated in anyway, then I would say its just because of them being a KID!