How do I introduce my dog-agressive dog to a new one?

i would bring the new one home on a leash of course and while waiting outside have someone bring the other one out and go for a walk ... do not allow them to meet or sniff each other ... walk as far and as long as you can ... this should decrease both dogs energy and when you turn around to come home, allow a little sniffing about ... if the big guy goes for the new guy, strong leash correction and a strong no and then start walking again ... when you get home, let your dog in the house first and then bring the new one in and keep him on the leash ... if your big dog seems okay lead the new one around the new home so he can get comfortable in his new environment ... if all is going well, then you can unleash the new one, always supervise until you are comfortable they are friends, it could be a day, it could be months ... always correct any negative behaviour, even if it is the new one growling at the big one ... always treat dingo first, first out before the littler one, always fed first, always greeted first, which will help cut down on "jealousy" or whatever it is in dog terms ... i work as a dog sitter with lots of little snappy dogs and when i start with a long tiring walk, i have only ever had one fight in the house and it was over in seconds ... good luck, i hope you get the new one ... sounds like he will be a good friend and influence on dingo :O)