Obi had thousands of Instagram followers for being "cute and derpy." His work on the streets of Indianapolis was another matter.

Police dogs bite thousands of Americans each year, including innocent bystanders, children, police officers, even their own handlers. The Marshall Project—in collaboration with AL.com, IndyStar and the Invisible Institute—examined more than 150 serious cases nationwide.

A series on the damage police dogs inflict on Americans, published in collaboration with AL.com, IndyStar and the Invisible Institute.

Growing up, few Black families in Ayanna Brooks’s neighborhood had dogs. A vicious attack reminded her why.

Law enforcement releases little information about their K-9s, despite injuries and death.

Why K-9s in Indianapolis have mauled so many people—and why that may change.