This is about dog on dog attacks, but the part I find interesting is the majority were off leash.
Yes, the most common breed was the Staffordshire bull terrier, but maybe its the kind of people who own them in these cases that are more interesting? See the staffie as tough, not using a leash?
I do remember that for many years JRTs were responsible for more bites to humans than any other breed in the UK.
"National and local news articles between September 2016 and February 2020 were identified through Yahoo and Google news. Information was retrieved including victim/attacker dog information (age, breed, size, sex, injury, veterinary treatment, on/off a lead, with/without the owner/walker), situation, intervention, owner injury, and outcome. In the majority of these attacks, one dog initiated the attack and this dog tended to be a medium-sized breed and off-leash. The most reported attacking breed was the Staffordshire bull terrier. The victim tended to be a small-sized dog, and these attacks often had adverse psychological and physical effects. Costs as a result of the attack ranged from £75 to £9,000 (~ $98-11,800 USD). The owner intervened in just under half of cases and often suffered injuries defending their dog.(Montrose, 2020)