The sonic deterrent makes a noise that is annoying to dogs. I have read that it can deter barking by about 90% and that if they have a good reason to bark (another dog walking by their space, etc) they will still bark, so it is not cruel like a collar. My OEG hen's are the same distance from my neighbor's door as from mine and they are LOUD when they get going, primarily because they are so shrill. It doesn't bother me, I think it is kinda cute and ridiculous after having heard larger hens all my life, but my neighbor and I are not on especially good terms (first thing they did on moving in was cut down a 10 foot laurel hedge that had been between our property for 20+ years so now they look right into my front door). My chickens are illegal intown and I have constantly changing neighbors who buy and sell to make money on the property - like my closest. I know that talking to them will do no good, I just want my girls to minimize their shrieking. I have a few years left before I can move out of town ( after my son graduates).