A San Francisco police spokesman says the 82-year-old woman was walking along Stow Lake in Golden Gate Park around 11 a.m. Friday when she told the boy to stop harassing the goose.
Police say a man, believed to be the boy's father, pushed the woman, knocking her to the ground.
The woman, who has not been named, hit her head on the pavement.
Police say the woman didn't appear to be badly hurt, but she was later hospitalized.
Police are looking for the man but have not provided a full description.
