I had just put the young chickens out in the new main coop with my rooster and hen last weekend. They apparently got out and were free ranging. Umbra was loose in the backyard. She's been off leash before with the young ones loose and minor supervision without problems. When we got home from services we found all 5 babies dead. She actually ate a chunk out of one. The rooster and the big hen were hiding in the coop unharmed. Alijah beat her upside the head with one of the dead chickens and we put her in her crate. Will she always be a chicken killer now? Does that fact that we had to give her heartworm treatment Tuesday have anything to do with the sudden killing things? She killed a squirrel a Wednesday. The rooster didn't protect the young hens because they had just been introduced into his flock? The rooster has beaten Umbra up a couple of times so she stays away from him and the big hen. I am mostly upset at myself for not securing the run and the young chickens good enough. I just want to figure out if there is someway to keep this from happening again. I want chickens and love my stupid, dumb dog. Any ideas?