The officer shot the pit bull after the dog bit her while she ticketed a bicyclist on the 10000 block of South Grape Street at 5:43 p.m.
The pit bull's owner was arrested for allegedly urging his two dogs to attack the officer following a minor confrontation. One of the pit bulls latched onto her upper thigh before it was shot.
The dog was gravely wounded and is not expected to survive.
The suspect was not the person being ticketed.
The officer was taken to a local hospital. She was treated and released.
CNS contributed to this report.