At the first sounds of ANYTHING prowling around outside we let our 3 big dogs out, and turn on all the outside lights to light up the yard.
We also use electric fencing around all the coops. We use the fence designed to keeps bulls in their pasture. It has a 5 mile range and we only have 100 feet of fence hooked to it. If anything touches it I'm confident it wont do it again.
Lastly I keep a shotgun by the door and another by my bed also keep a spot light by the door if we have to go outside.
Our area gets Brown and Black bears passing through as well as fox, lynx, coyotes, wolfs and moose.
You might not think of moose as dangerous but late in the winter when their cold tired and hungry they get ornery. If a moose gets the lid of your feed bin they wont leave until its empty. Then they come back the next day and the next. They will tear down fences to get to it also.