Only thing i can find is non breed specific. I did find this on the American Humane website which I would consider non-biased but this doesn't have the stray stats. I just thought it was an interesting breakdown of dog bites.
http://www.americanhumane.org/animal...dog-bites.html
Here are the very generalized stats on strays
http://www.aspca.org/about-us/faq/pet-statistics.aspx
Time to set down the young dog lawyer briefcase and goto sleep.