SISTERS, OR -- An aggressive dog remains at large in the Sisters area, after knocking down a woman, last week. The Deschutes County Sheriff’s Office says a 62-year-old victim was walking her dogs Wednesday evening, when a pit bull knocked her to the ground then stood over her, growling.

A passerby scared the animal off, and the woman was driven to the Sisters-Camp Sherman Fire Department; she was later transported to the hospital with a leg injury that required surgery.

The Sheriff’s Office is asking for the public's help in locating the dog and any witnesses to the incident. The dog is described as a brown and white pit bull or pit bull-mix.