Ok, here's the full story...not quite as vicious as originally relayed, but still ridiculous.
My wife had Jason (our 1-year old) in the bathroom with her. She was taking him with her to avoid letting him walk around the house by himself. She had been doing this the whole trip, actually. Anyway, our 4-year old, Tyson, was out in the living room on the couch, playing with his tablet. My brother-in-law, who is 15, was playing Xbox on the couch next to him.
Jason started pounding on the door, wanting out. My wife had put the dog out, so she called out to Tyson and told him to watch Jason for a minute. It was literally going to be less than a minute. Jason walked out to Tyson and was watching him play. Someone went and let the dog in, and it came up to my kids. My brother-in-law at this point was supposed to put her back out, but he kept on with his game.
My older son, grabbed Jason's hand and started to move him back, because he'd seen us move him away from the dog the whole time. When he pulled on Jason, the dog snapped. Luckily he was pulling on Jason, because it caused it to just graze him rather than clamp down. At that my wife was coming back into the room and she grabbed Jason and my brother-in-law had pulled the dog back. My father-in-law was on the other side of the room and he was just dumbfounded.
Scary situation, and it's more of a close call than something serious. Thank goodness.
Here he is late last night, after he got treatment. He has another puncture lower on his cheek, which is the one that will scar. That one next to his eye should not. The cut on his forehead most definitely will scar.