This website really offers the most unbiased info I have seen. Everyone should read this next passage
all the way through.
There have been many news reports about deaths caused by dogs in the USA. The attention given to the homicides has put the spotlight on pit bulls and Rottweilers. There is a very good reason for focusing on these two breeds: in recent years, they have usually been the number one and number two canine killers of humans. (See below,
The breeds most likely to kill.) It therefore is correct to single out those two breeds when talking about canine homicides, because those two breeds lately have caused half or more of the deaths -- a disgraceful statistic whether it is regarded as the fault of the dogs, their breeders, their owners, or all three.
However, the focus on death cases may leave the public with the false impression that pit bulls and Rottweilers are responsible for the dog bite epidemic. It is a much broader problem than that, involving all dogs and all dog owners. While pit bulls and Rottweilers inflict a disproportionate number of serious and even fatal injuries, the dog bite epidemic involves many different breeds, and results from many different causes. A clear distinction needs to be made between canine homicides (i.e., incidents in which dogs kill people) and the dog bite epidemic.
The confusion caused by discussing the homicides and the dog bites in the same breath has its most important ramification in the area of prevention. Some are advocating the banning of pit bulls, Rottweilers and possibly other breeds, for reasons that range from their alleged dangerousness to the fact that they are very often treated inhumanely. Those who hear about the homicides often support breed bans. (See
Breed Specific Laws, Regulations and Bans.)
However, while banning the pit bull might lower the number of human deaths, such a ban would probably not reduce the number dog bites in any significant manner. After the United Kingdom banned pit bulls in the 1990s, a study showed that the number of dog bites remained the same even though the number of pit bulls had steeply declined. (Study cited in B. Heady and P. Krause, "Health Benefits and Potential Public Savings Due to Pets: Australian and German Survey Results," Australian Social Monitor, Vol.2, No.2, May 1999.)
http://www.dogbitelaw.com/PAGES/statistics.html#homicide