BigDog is correct. You really do have to take them out into the world - leashed, of course Socializing does more than just teach them the differences between normal behaviour and threatening behaviours, or even how to be a well-mannered dog - it builds your dog's confidence. A confident dog is a stable dog, and that's what we're after. When you get a dog like a Fila - or any dog for that matter - that doesn't have a good level of self-confidence you've got trouble waiting to happen.