No matter how good your dog is, no matter how good your kid is, no matter how much you trust the dog, no matter how short the time, never, never, never leave a dog unsupervised with a small child. I just read this article. The outcome for the child, the family and the dog is horrible.
http://www.foxnews.com/story/0,2933,426521,00.html
http://www.foxnews.com/story/0,2933,426521,00.html