There'a a mountain lion that attacked a dog roaming around the area of La Cresenta.
From the article:
Los Angeles County Supervisor Mike Antonovich urged residents to follow guidelines provided by the State Department of Fish and Game to avoid coming in contact with a mountain lion. They include:
Avoid hiking, biking, or jogging alone;
Don't feed dear; it is illegal in California and it will attract mountain lions. Mountain lions generally exist wherever deer, their primary prey, are found;
Deer-proof your landscaping by avoiding plants that deer like to eat;
Trim brush to reduce hiding places for mountain lions;
Don't leave small children or pets outside unattended;
Install motion sensitive lighting around the house; and bring pet food inside to avoid attracting raccoons, opossums, and other potential mountain lion prey.