normal behavour really , you need too sort the dog out as it grows you dictate , it will soon learn the hand what feeds it and all that , as for your kids that's your decision , too me it would depend how malicious the dogs reaction was , pups are learning and its a natural re- action too any pack member too protect there food , learn from it , sort it yourself and then you will earn the dogs trust and go on from there , you cant 100 % trust any dog , that's a fact , trust is built on a bond between its master , dogs are my world and you have too make decisions very carefully and thoughtfull