State Library of Tasmania : News and newspapers) I can access Newsbank and search back until the late 1990's for articles. I have emailed myself hundreds of articles from all across Australia for the past 5 years. I spent hours sifting through the search results to discount AFL Bulldogs team, and other articles that had nothing to do with actual dogs or attacks. Then, once you have just the dog attacks (I have attacks on other animals as well as humans) you have to sort them into a Database (and decide right from the start what information you are going to keep, I have a column in mine that included severity and circumstances). Then you have to decide which article you are going to get your facts from. For example, the Bull Terrier that attacked the child in the pram was originally reported to be a pit bull. What do you do if you have two dogs and one victim? Or one dog and three victims? A spreadsheet really isn't sufficient to capture all that data so that it can be analysed properly. You really need a proper database, like Access if you have it.
But it's an insanely huge and time consuming task. I spent a few hours going through articles and haven't even gotten past Ayen Choll (not to mention all the articles that were written since I started the project). One thing I found interesting is the inconsistency in reporting sequence of events (I know it takes a few days to find out what actually happened). I think I can only remember one or two of the articles stating the order in which it all happened. Most articles focused on the attack on Ayen, and then mentioned injuries to the other family members, which I think lead to the belief that the dog chased Ayen inside and then attacked the others.
My sympathy goes out to Ayen's family. It must be one of the most traumatic ways to lose a child.
I'm going to have to scale my research down to just Tasmania. But all in all, as I mentioned, the media only report a very small number of dog attacks. I've tried contacting the Health Department to get statistics, but haven't gotten a response. NISU and VISS (Monash) have the most relevant data that I can find (at least that relates to Australia).