"Terrier" and "husky" don't scream fetch to me. I'll bet you gave him even more of an aversion to toys by shoving them in his mouth, a practice which he won't understand. Why not try something like hide and seek? Have the dog sit in one room and the child go hide somewhere (easy at first) like around a door and then call the dog. Praise wildly or give the dog a treat when it goes and finds the child.