Sorry for your loss
@Chickalish I am coming in late... As a chicken keeper here in San Diego myself I have lost three complete flocks to predators. Dogs in the city and Coyotes Bobcats and Raccoons in the mountains.
Livestock Guardian Dog? Coyotes may dig under but won't be leaving under their own power.
In the city I lost a cat to a red tailed hawk. The only thing you can do is reinforce and fortify fencing.... Here in the desert once livestock moves in the predators line up for the buffet.
The worst offenders are Coyotes.... Coyote fence or no jump fence works but you have to get creative to build one yourself. Cyotes will climb over chain link or dig under... My last flock was taken four or five years ago I wont be getting chickens again till I can rebuild the Poultry house and fortifiy fencing which will include electric fence run both on the top of the fence and on the bottom about nose height.
The run will be 24 x 50 and covered with Aviary netting designed to keep birds in. Its a reasonable cost too. No free ranging... sigh... and I have eighteen acres. My last flock was over thirty.... They were gone in seven days... Coyotes...
For what its worth we do have foxes here... They are not red they are colored like dark coyotes. All forms of owls from Ground owls that live in sandy areas, Great Horned Owls, Barn Owls, Flammulated Owl (fit in your hand), Screech Owl, Spotted Owl, Long eared Owl, Short eared Owl, and Saw ette Owl.... this info came from SDSU site but most of them I knew already.
http://map.sdsu.edu/group2007Spring/group2/Typical Owls.htm And thats just owls... Most are mouse eaters...
I have spent the last fifteen years doing research on predators and Trying to perfect my methods for keeping chickens.... While I realize perfection is unobtainable The more I reach for it the better I get.
Please console yourself that there really was nothing you could have done. The best way to cope is to resolve to reinforce....
deb