If one were to chain a dog out for an extremely long time and never bring it into the family, aggression can certainly develop. That's why many states have chaining laws:
http://www.dogsdeservebetter.com/home.html
However, if one were to chain a dog briefly to allow it to eliminate, I don't think that's a problem at all, especially if you keep it to a minimum of, say, 20 minutes or so.