These guys are all 11.5 weeks. The one second from the right has a bare spot on his back. I've noticed this ever since one of our Great Pyrenees played with him. Does this look like something I should worry about? Thank you.
Evidently the dog pulled out some of his feathers. The little stubbly things appearing are pin feathers that will replace the pulled out feathers. Everything is going fine - nothing to worry about.
Since the pin feathers have emerged, I would expect the feather to grow in the next few days. They will look like feather dusters with the fuzzy part breaking through the top of the pin. In two or three weeks the bird should look perfectly normal.