ditto, everyone else's suggestions and thoughts.
This isn't at all helpful but there is really no way of knowing when or if a dog will bite. All dogs can bite. Small, large, wild, trained, loved, abused, every breed. My nephew had to have facial reconstruction surgery after a family lab, who he had known his whole childhood, bit him on the face when he accidentally stepped on his foot. This was a stable, trained, loved, family dog. I've been around dogs my whole life and have been bitten twice. Both were family dogs that I knew well. You just never know.