Dogs exposed to a variety of other dogs early on in life are not likely to develop this kind of aggression. This can be a big liability for owners and makes the dog much less enjoyable to walk and take places. Often, dog-aggressiveness is based on insecurity or mishandling and can be permanently overcome with the help of an experienced professional animal behaviorist.
In other cases, the aggression is built into fighting breeds that have been genetically engineered for centuries to attack and kill other dogs! In that case, a professional consultation is of utmost importance before the dog commits a tragic act and incurs the legal wrath of a victim's owner. Lawsuits involving not just veterinary bills but emotional duress, pain and suffering are increasingly common and should be avoided at all costs!
If you own a dog that wants to attack other dogs, do something about it now before it's too late. Your local Humane Society your veterinarian and the Yellow Pages are good sources of professional behaviorists to assist you with this potentially very serious problem.