A search was quickly organized, with people on horseback assisted by the Pasadena Humane Society. They have combed the surrounding area, but as of late Thursday afternoon, "Lilly" still had not been spotted.
Here is "Lilly's" description. She is five years old and was fully tacked with saddle, bridle and halter, but not shod with any horseshoes.
If you have any information on the missing horse, you are asked to call the Pasadena Humane Society at (626) 792-7151.