I agree with all the above. Socialize , socialize. It might be a good idea to take the bigger dog to training to make sure it will listen to you in case a situation does ever arise.
Good to see another South African on the site. I think there are four of us now, (including Lauren, who is now a Californian! lol)
Your will love it here. I am addicted! Such wonderful, caring people with lots of good info!