Three of four pit bulls that slaughtered 42 goats in Southern California have been captured. "It appears that the pack mentality set in," a spokesman for the LA County Department of Animal Care and Control. "They just fed off one another's energy and mischievous behavior." Authorities are still seeking the other dog and the dogs' owners, reports the Los Angeles Times. None of the animals had identifying tags or microchips. The pack entered a corral in Lake Los Angeles with about 50 goats, and killed most of them before they were discovered. "This is tragic and completely avoidable," said an official. "When dogs run at large, particularly in packs, they tend to act up." (More goats stories.)