We don't have much of a problem here because my dogs repel most predators, including other dogs. But I was thinking, for those who can't or don't want to shoot or trap, maybe one of these might scare off dogs, cats, hawks etc.
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Of course you'd have to be there at the time of the intrusion in order to use it. Truly, good fencing, coop and run is the best all round, all the time protection. Yeah, it's gonna cost you, but it's well worth it for the peace of mind. If a dog can easily get to your chickens, then so can a fox, raccoon or any other predator.