Realizing that not every product works for every animal because, well, each one is different - different dispositions, different behavioral issues, different backgrounds and "childhoods", different "parents", etc. This product received mixed reviews, but I took a chance and ordered it anyway, and I am so glad I did. I actually ordered it for my new Havanese puppy because she seemed to be experiencing quite a bit of anxiety with several things. Giving her a bath totally freaks her out, massive pulling on the leash (really? A baby Havanese?!), cutting her hair was another one, trying to train her to come, sit, etc was yet another. Any of these activities caused her to sit underneath the end table for hours on end. I do have the Thundershirt and put that on her, and it seemed to work miracles, but what's one to do when it's 85-90 degrees out?! Further, I was also concerned that she seemed to be averse to receiving affection - if I pet her or picked her up, she looked away, ran away, or her heart beat 90 miles per hour. It's harder to train a puppy when you can't give the "good dog" scratch, either on the chest, back, etc, since she seems to have no association to wanting to please the owner as most dogs do. It's the weirdest thing. I also have a mini schnauzer who is 6 years old, who is very well-trained, and has never really had too many behavioral problems I couldn't correct. The main one was the shrieking and screaming she does when I come home. I am to blame for that one because I have allowed it for years, but it seems a little worse now than when I lived abroad with her. At any rate, I don't mind the excitement she feels when she sees me, as I think we mostly ALL live for that emotion dogs have when they love to see their owners...but the shrieking has gotten out of control. I used to have her off-leash for the first 5 years of her life, and when I returned to the States, I was informed there were dog leash laws even if she was trained! And then once she chased a rabbit for several blocks, and that was the end of the off-leash time anyway. She was sort of leash trained, but being that I never had to have her on a leash because I trained her to be close, stop when told, walk, sit, stand, lay, "quiet" on command using both words and hand signals - I didn't need a leash. And so now, moving to the big city...I don't know if she is hyper-aware or what is going on, but she shrieks at people, lunges at them (but doesn't bite, but she even scares me!), constantly pulls on the leash, etc. Having said that, the purchase was for the Havanese - not the Schnauzer, but I wanted to test it out and see what would happen when my husband came home about 15 minutes later. Typically when he arrives, the shrieking begins, and usually lasts for about 10 minutes, I have to ask her to stop via constant "quiet" commands, which mostly do not work. With this special collar, I wanted to see what would happen. When my husband came through the door, she did show she was excited, but it was very muted...no shrieking at all! I was really shocked. I never thought a collar could really achieve that. When we went for the evening walk, she pulled so much less, and if she pulled at all, she responded to the first command. She didn't shriek at anyone on the street either. She did bark at one guy, but no shrieking! I never actually thought of her as being an anxious dog - she loves us, and she loves to meet people...she loves cats and other animals, but anxious? Never (says the "parent" in denial)! Wow, she is amazingly calm with this collar - I still can't believe it. I think my Havanese is reaping the benefits as well, even without the collar on (she was smelling it, and so were the cats!). However, I do plan to try the collar on her directly because I am interested in her results as well. (She looks adorable with the Thundershirt on, but ripping apart the velcro to take the shirt off at night causes her a lot of angst!) This product received mixed reviews here on Amazon, and I am glad I took the chance. Fortunately for me, it did work for my schnauzer. I have not tried it directly on my Havanese, but she seems to be even more receptive to being petted and loved, even though the collar is on the schnauzer! Amazing!