This device has made a huge turn around in my 4-year-old chihuahua but it doesn’t seem to really phase my 4-month-old at all, which is ok because the 4-year-old is the one with aggression and a barking problem. Those that say it doesn’t work maybe you need to turn it up because like I said it works for one dog but not both for some reason. Well worth the money and I have some peace and quiet in my home now.
Bottom Line: Yes, I would recommend this to a friend
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