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I don't know what part of the country you live in but it sounds like you have a fox and she might have kits or kits on the way. Once the easy ground targets are gone she/he will start on the small chickens then move on to the larger fowl. Your guard dogs must being taking too many coffee and donut breaks
Are they being so active during the day they are sleeping too much at night? Maybe your dogs are getting older and you need some younger dogs added to you mix?
At a boarding stable that I worked at we had a large fox wipe out a flock of nine chickens in 2 days, then 4 ducks were gone in another two days. The ducks were hard for the fox to get because they only came on shore to eat as far as I could tell and I would feed them during daylight hours. Once some else start feeding only ever couple days and they had to forage more they started disappearing. The chickens were kept in a "coop" made of wire and a wood top. The wire had holes big enough for the goats to fit through. I could fix it all I wanted but with out the correct material the goats would just destroy it again. We know it was a fox because more than one person saw it at night. They reported it as a big fox, the same size as my miniature schnauzers, which are not very small dogs. I wouldn't find a feather one unless I went out searching far off in the pasture, then maybe I would come across a few feathers and bones.
Your sudden onset of a critter killing off your flock is probably someone dumping off a pest in your area, relocating! If you do trap and relocate, by sure to take the critter far from others, in an area where it can survive; IE wetlands, forest, fields .... something similar to your place with wild flocks, otherwise it will only come back to your area. If it is a momma, you need to find the kits, cubs, hatchlings... what ever they are so they don't die off too. Maybe it would be better the get a more active dog, build a safe coop, or bring everyone in the house at night
(Now there's an idea!!)