Police said the dog, Lolly, a 3-year-old border collie, attacked Williams, who, according to law enforcement paperwork, shot the dog, KSHB reported.
The dog was a service animal for the female victim, who has a condition that causes joint pain, dizziness and panic attacks.
Lolly had to have surgery close the gunshot wound and repair a ruptured spleen. She also had other injuries, KSHB reported.
Her owner, the woman’s brother and her boyfriend were also injured in the attack, police said.
Williams has been charged with three counts of second-degree assault causing substantial injury to a service dog, among other charges, police said.