Didn't work for my bark determined puppy
589822
This was our 2nd ultrasonic trainer - see my other review for the other brand that didn't work. It confused her for about a day then she could care less. The only time it worked was when she was barking so much my mom threw it at her!

Now we use a spray bottle and she quites down.
4935686
The tune-able whistle seemed like a good idea, but it did not solve my problem - neighbor's dog was only aggravated by the whistle and barked more.
214194
This thing didn't work for us. It got triggered more by music, TV or general talking than any barking. The dogs went nuts one night because there was music playing and we had no idea it was triggering the device. It seems to be overly sensitive to all noises but barking. I wouldn't buy it. We returned it as soon as we found out it was going off non stop to the music.
2335184
I chose this over other models because it seemed better equipped to do the job. When I received it I was anxious to use it thinking it would stop our neighbor 's dog from barking. I followed the instructions very carefully and placed the product approximately 15' from the barking dogs and left it there for about 45 minutes and the dogs never stopped barking. I returned the product.
4712423
My dog didn't respond to any of the whistle. Ended up sending it to the thrift store. Other training techniques have been working better for my dog. Though it did make me feel like I was a member of the Von Trapp family in the Sound of Music
929719
Did not work at all for my Great Pyrenees who are known to be barkers so it may work for another dog. I returned the product and got a bark collar which has worked wonders for her.
3146441
This did not calm my pups one bit.  Now, I have chihuahua mixes that are your stereotypical chihuahuas.  They bark at everyone and everything.  I read the reviews and it does seem to work for other pups...just not mine.  I hope it works for your pups.
1479713
I bought this for my Shih Tzu because I was told that it would cause him not to bark at other dogs when they walk by.  NO DICE!!  It did not work at all.  After speaking to a pet trainer this product is intended for anxiety and if the barking is not caused by anxiety then it is not the right way to go.
1731488
Bought this for my 45 lb goldendoodle, he's a year and 1/2 old and trained, he has separation anxiety when I leave the home in the morning for work... needless to say he still continued to barked and freaked out for a week straight after wearing this jacket and it just didn't work.  I'm going to leave it on him for another week and see if anything changes but I doubt it, I don't want to have to put him on medicine and was hoping this was going to work but..sadly, it didn't.
3033322
I was so excited about this based on the reviews, but my dog just couldn't care less about the sound or the vibration. She just kept barking, and wasn't phased at all. Very disappointed. I'm happy it's worked for others, but I will be returning mine.
2571108
I tried this on both of our dogs and the dogs would bark and nothing happened, but on the smallest dog it would go off for no reason and cause the dog to bark.
864073
This product works OK if your dog only barks once or twice and then stops.  My dog was able to keep barking and would "bark out" the collar, then of course it didn't work.
810517
did nothing for my doggie but i did end up getting a spary collar when he barks now that work perfectly. sorry dog whistle....
3473158
Tried to introduce it gently, no luck. My terrier hated it, and fussed until she pulled it off over her ears.  Before then she ran around like a maniac, mostly backwards.  For her, at least, I think a transparent collar may work better.
738397
I have another brand of bark collar and while less expensive than my other collar, this one is a stretch to be held as a viable option.  Sensitivity does adjust but the dog barks for quite a while before receiving correction.  It beeps even when she's scratching her neck.  Once used to another brand that works more effectively, I think I'd stay away from this knowing what I know now.  Could be my dog's a bit dense but ----
1254368
Worked we'll initially to stop the barking. But over time the barking returned. I have to say my dog is a particularly tough problem.
2035097
Great concept item; unfortunately my puppy did not adapt to the concept of pushing the button to go outside. However, she is now trained to run to the door any time she hears a doorbell ring (even on t.v.) Cute, but didn't accomplish what we wanted it to. It was returned.