Recently, I was commiserating with a trainer friend of mine. One of her clients had contacted her to let her know that they had surrendered their dog to a shelter because the dog had bitten their ten year old daughter. My friend, shocked to hear this, pressed for details. It turned out the dog had gotten loose in a busy area, the daughter had grabbed him, and, startled, he turned around and bit her. The bite left no marks, so it was what trainers refer to as a "grab-bite."
My friend was devastated, and I was too, once I heard the details. The owner felt she had done something right by relinquishing the dog, citing that she "couldn't take chances" with her children. As a parent myself, I understand that - but what this client didn't understand is that her (now former) dog had shown her that he absolutely could be trusted with her kids.