[VladFal]

The CDC stopped keeping track of breeds involved in bites - I do not know of any sources which accurately keep track of that type of information. Of course, there is a never ending supply of info out on the web about dog bites, etc. I find this article to be a good (and credible) one but it does not give breed stats so most likely not helpful to what you are wanting.

http://www.avma.org/public_health/dogbite/dogbite.pdf