Best Friends Animal Society, “Protecting the Public while Preserving Responsible Owners’ Property Rights,” bestfriends.org (accessed July 6, 2021)

This source shows that pitbull bans did nothing to reduce bite attacks in Spain, showing the same numbers 5 years before and after the ban.

They also state this:

Best Friends Animal Society explains three mitigating factors in dog attacks: 97% of the owners had not sterilized the dogs; 84% of the owners had abused or neglected their dogs; and 78% were using the dogs as guard dogs or breeding dogs instead of keeping the dogs as pets.

Then there's this one:

ASPCA, “Position Statement on Breed-Specific Legislation,” aspca.org (accessed July 6, 2021)

Council Bluff, Iowa, banned pitbulls, and saw Boxer and Labrador Retriever bites rise as those were the breeds people switched to.

Same source shows that it Winnipeg, Canada, instead saw Rottweiler bite attacks increase.

And from this source:

Emily Anthes, “But How Much Does Breed Shape a Dog’s Health and Behavior?,” nytimes.com, Feb. 9, 2025

Rather than breed traits, the ASPCA notes chaining and tethering dogs outside, lack of obedience training, and selective breeding for protection or fighting are risk factors for dog attacks.