The incident happened about 9 a.m. in the 1800 block of South Patton Court, said John White, a Denver Police Department spokesman.
Police and paramedics were called to the scene and the woman was treated for injuries, White said. Further details on the injuries were not available. Her name was not released.
Officers found the vicious dog nearby, White said.
The dog made “very aggressive moves…one officer fired, striking the vicious dog in the shoulder,” White said.
The dog is in custody of the Denver Animal Control Office , White said.
Investigators are trying to determine who owns the dog.