I have been wanting to buy a Thundershirt for my dog for some time now to see if it would help her with her severe storm anxiety. It's only a slight exaggeration to say she begins freaking out when it rains in a state that borders ours. By the time that storm arrives in our state, it's an ugly scene with non-stop panting, crazy shivering of her whole body, and this whining/squeaking sound that I cannot describe - but can say it gives me a strong craving for Xanax after two minutes. During the slightest rain event we both become anxious, stressed ladies who just wish we could be at the beach. The actual Thundershirt is quite expensive for someone on my budget and I've felt guilty more than once that I couldn't afford it to see if it would help my girl, Biscuit, even just a tiny bit. Then two nights ago I came across this anxiety reducing vest with reviews that were mostly positive and with the price coming in about 1/3 of the name brand shirt... Well, I had no excuse not to at least try it. For Biscuit's sake and my continued life this on side of sanity. The shirt arrived the very next day and that was perfect because severe weather was forecast for that evening. I took it out of the box (which was free of burdensome items such as instructions, do's and don'ts or hints on proper use of the vest) and promptly put it on Biscuit taking care to get it tight enough but not too tight. I must have succeeded because I kid you not, the results were instantaneous. She quit panting at once and her eyes which had been bulging half out of her head were immediately changed into heavy-lidded windows into her relaxed and calm soul. It really was a miracle. She turned into a fearless, laidback, and carefree agent of calm who was able to enjoy the thunder & lightening and the wind & rain while lying on the couch and displaying absolutely zero symptoms of her extreme fear of inclement weather. She did begin to shiver very sightly after one extra loud thunder but it lasted only about one minute and was gone. She went into a relaxed asleep and didn't wake up until the next morning. This was huge because her little fits of extreme terror were very upsetting for her and for our whole family who hated to see her so afraid and who were also frustrated with being unable to calm her, even with prescribed medication. REVIEW SUMMARY: This vest truly performed like it says it should for my 5lb., always somewhat nervous ratchi, keeping her calm and unafraid during a night of severe weather. It did what medication and tons of mollycoddling and extra loving could not do by allowing Biscuit to nap, snack and be a happy girl during storms that usually turned her into a whining, panting, shaking pile of terrified fur. Highly recommend this item as it restored peace to my dog, my family and our home; and as a bonus it was 1/3 the price of the name brand anxiety shirt and is well-made, attractive and fits well using the size chart provided by the manufacturer. A great value and a valuable purchase, highly recommended by both Biscuit and by me.