Finally got my answer from brazil where I forwarded it to my brother in law, and he said the dogs look toward him and hesitate, but he blows it some more, and they quit. They also do not bark so early or so late. He is slowly but surely training them. Should say also that they are neighbors dogs who have been keeping him up for months. He thanks you for his nights sleep.

The first truly (nearly) silent whistle I've found. Excellent.

I thought this would be nice so that I would not bother people around me, but so far the GSP does not respond to this for a recall. I may not have it adjusted right. I used the 3rd place for distance. I also have the Acme Tornado 635, and the dog does respond to this if not to far away. However, Steve's pick, the small Thunderer works the best.

Acme is the original and no one has done it better since. Love 'em.

We LOVE this whistle. I like it so much that I purchased a 2nd just to have in case we misplace one. Our GSP is 2.5yr and responds very well to the whistle. We use it for recall at the park and off leash activities. Great product, durable and easy to adjust the pitch. Definitely recommend.

It did not work for silencing a barking dog next door. I thought I had read the comments online that it would be effective for this purpose. I received a response from your company that it is not for that. I don't have any of my paperwork to return it, so it's really of no use to me. Sincerely, Linda Griffin

Hasn't worked yet.

I was very pleasantly surprised by the obvious quality of the Acme Dog Whistle. It has good weight to it and is just the right size to fit in the hand. The chain is a very nice feature. I don't have to worry about losing half of the whistle. I've used other silent whistles in the past and this one is by far the best. It's well worth the money!

Trained my dogs from the beginning with it. Works great and you don't have to annoy every other hunter within a mile!

Works well in training. Still need to try under actual working conditions.

It is the best.

Just bought another as a gift for my daughter to use to train their new dog - a Lab/Dane mix. She was impressed when she saw my Husky turn and come back to us upon hearing my whistle signal.

Very good whistle! Worth the money. Can't find anything better.

Works great. She is now two months and responds well when I pip the whistle. Started with a short leash, and she would come for a treat. Gradually going to work her up to coming to me with no leash at all!

Works well and seems to have good range. The only negatives are the shiny finish and the adjustment has a mind of its own, so you constantly have to check it.

Very effective whistle. I mean your dog will ALWAYS respond to it every time you use it. I thought it was over rated, but was I wrong. Just get one, and you'll see.

I am a trainer specializing in Service Dogs and encourage clients to use this style of whistle for recall, runaways, especially disabled handlers that need a foolproof recall method. They are invaluable, and clients swear by the whistles after the dog is properly trained to respond. They save lives! However, due to how much an average client will spend, I needed to offer a cheaper knock-off of the Acme whistle I extensively hunted for just so I could have a $10 whistle, and clients would get something in hand, that works, and use it. Then maybe later, they'll step up to a real Acme Silent Dog Whistle. Business has been awesome, so I decided to treat myself and bought two Acme Silent Dog Whistles, one to replace the knock-off I wear on my neck, and the other on my key-chain. WOW!!! What a beautiful whistle! Well made! The design is excellent including the set-screw to lock the whistle together so you don't loose the bottom half after you adjust the frequency, and the range of high quality frequencies available by this whistle is fantastic! I will buy a few more of these to have on hand to able to able to offer to my clients interested in a classier high-quality option for a whistle, and now I can demonstrate the awesome differences.

Am amazed how well it works. It only took two days to train my dogs to come upon whistle command. Highly recommended.

A work in progress. My dog responds to it very well, unless she is significantly preoccupied. Then continual blasts usually get her attention. I totally like the way it is designed and crafted. Will see next winter when my lips are cold if I can pucker up enough to make it work.

Wonderful product! Good quality and effect, as expected.

Really works.

My 13 yr old Daisy is going deaf. The whistle is great for getting her attention; she is already learning to come when she hears it. You can teach an old dog new tricks.

Excellent. It works very well. The dog pays attention. When I bought it I had a second thought, but today that I have it works. Thank you

I'm not sure there is a need for the cover piece which is attached by chain. It does get in the way at times. The entire assembly is beautifully finished. It really gets the attention of my two Labs who are "selectively deaf" to a conventional whistle much of the time.

Pros: It doesn't make my ears ring like my old Roy Gonia. It doesn't disturb the neighbors, and my pup definitely hears it. I keep it set on the lowest frequency, so I can still hear it when I give sloppy commands. Cons: Whistle is very narrow and heavy for its size, so it is difficult to hold between my teeth for extended periods. This is problematic since I never take it out of my mouth during a training session. I detached the cover because it was in the way; served little function and added a lot of weight. I also slid two layers of surgical tubing over the mouthpiece. This increased the diameter which made it easier to hold, but the mouthpiece is still very short, and my lower lip has a tendency to block the air slot on top if the mouthpiece rotates in my mouth. This muddies up my commands. Due to the round shape it is difficult to keep the air slot on top. Conclusion: It performs as advertised, but the ergonomics are problematic for my purposes. I'd be better off with a quiet, single tone like the Acme Sonec.

How about a break on the Acme. I have ordered 4 already and plan on ordering 5 more this time. Best product ever. I have been using it in working with my SAR Malinois!

Was easy to train dogs to whistle. Use it to change direction while hunting with dogs. Reduces unnecessary noise when bird hunting.

Great whistle of a very high quality.

Could never keep the proper adjustment for my dog to hear it consistently. Also, the ring pulled out in the brush and I lost it. The Acme 211 1/4 works great, but I desire a silent whistle.

Have used this whistle since the mid 1950's to train my dogs. I have not used any other whistle. Still have the original whistle.