here, he could help you get a personal protection dog that could do Schutzhund if that is the training you want to do.
A dog trained in the sport should be fine around young children...as long as the dog is of good temperament!
I like starting out with a puppy, especially if you have young children, and the cost is less than buying a green dog or one that already has some training done. Some don't want to deal with that puppy stage, and paying more(quadruple) for a dog that has foundation done is worth it to them.
I wouldn't go with some of the online ads for personal protection trained dogs....unless you want to spend over the top rediculous amount of money.