What's the latest about the owner?
The bottom line is that even the best trained, most disciplined pit-bull (or similar) can be a threat to a child. Any animal can behave erratically. I once had to prize an alsation off my arm (some time ago, I was delivering papers

). The dog's owners rushed to help me whereupon they told me how amazed they were as to how he had reacted. Apparently he was normally docile, etc etc. If that had happened today the owners would have been taken through the courts.
The problem is that the most dangerous types of dogs (e.g. pitbulls) tend to be owned by those least suited to looking after dangerous dogs. They seem to see them as little more than status symbols.
Matt