IT WORKS!!! day 1 my cat wouldn't move and I felt bad but I just knew he had to get used to it. day 2 he started to move around a little bit day 3 he was out of hiding and all the tension he always carried in his tail WAS GONE!!! Day 4 he started to stop hiding completely and wanted to be pet and loved on. I LOVE THIS THING!!

If you are buying directly from the "Thundershirt" seller here on Amazon, they are offloading inventory of an older version at full retail price. I contacted the seller and they confirmed that they are using Amazon to dump their old inventory, then they directed me to their own website. If you pay for Amazon Prime you should be more than a little annoyed by this - they are taking advantage of you.

That said, if you have ever put a harness or clothing on your cat you will see a near-identical result from using this item. The newer version has a pheromone patch, but you will not get it when ordering on Amazon. Personally I would not spend $40 as almost any article of clothing that fits your cat will have the same effect. After two uses the threads at the seams are coming loose, so you aren't paying for quality.

If you're looking for the right fit, my 10LB cat seems to fit well into the medium version. It restricts her motion quite a lot (struggles getting on the couch/bed, and can't reach the counter). She ended up chewing on her arm near the jacket constantly, pulling out a lot of her fur. Pretty much the opposite of what you'd hope to accomplish with this product.

My cat Charmander has always been an anxious cat. But then I moved and he escaped into the basement and got into the foundation of the house and was missing for about a week. When I got him back I knew I had to do something to reduce his anxiety and hiding tendency. I bought this thunder shirt for him after reading some bad reviews on the calming collars I was going to get. I'm so glad I went with this. I put it on him for about an hour or two consecutively for three days and then had him sit on me or with me with it on. When it looked like he wanted to hide or was scared I took it off of him and let him go. After three days of this he was coming out on his own and seeking attention of my roommates which has never happened before. He's currently laying with me with other people around and before he'd only ever come out if it was just me and him. I thank you, thunder shirt, for decreasing my cats anxiety.

Also, I highly recommend this seller. Shipping was extremely fast and there were no issues.

It's like a kitty sedative! I put the ThunderShirt on my sometimes anxious tabby and he chills right out. Office visits, kenneling and traveling are a breeze.. Just recently we introduced a new kitty to our family which made our tabby even more anxious. After a few days of patient "encounters" with the TS on and they became comfortable enough to be in the same room with each other without hissing and spitting (they are now fast friends). Thank you ThunderShirt people!

Failed-foster parent to three feline siblings here.

Our guys were barely four-weeks-old when we first brought them home and very sick. Fast forward two years: they're now enormous and highly active, Siberian-mix cats"¦ and an oft-naughty trio! Over these past couple years, Thundershirts have helped (and continue to help) us with myriad, feline behavioral issues.

The first Thundershirt, we bought in hopes of quelling our girl, Tawny's, extreme vocalization issue "” which was SO loud and persistent, we honestly worried about disturbing our condo neighbors. Fortunately, Tawny took to the Thundershirt like a fish in water! Not only did it succeed in completely calming her down / shushing her up"¦ she lovvvves that shirt so much, she actually *prances* around when it's on (no kidding).

Our boy cat, Raymond, went through a very long period (1+ year) of self-suckling and suckling his sisters' fur. We tried every, possible recommended cure "” including getting him a stuffed animal buddy with a mechanical heartbeat and internal warmer. Then, we bought a second Thundershirt for Raymond, fingers-crossed"¦ and success again! It wasn't long before Raymond went from constant-suckle-mode to once/twice-per-day, then eventually stopped altogether.

Our third cat, Polly, although gregarious and confident when at home, was *terrified* of unfamiliar people "” not to mention being taken even two steps outside our door"¦ say, to the vet. I'm talking: yowls so intense, one might wonder if the animal was being tortured. Needless to say, we felt as horrible subjecting Polly to such fright, as likely she did to enduring it! Two months ago, during a sibling-on-sibling Wrestlemania, Polly's retina was scratched. Waking up to find her eye swollen shut, we needed to get her to the vet"¦ hopefully, with as little drama as possible, on the day before a long car trip. With Raymond's Thundershirt on, plus "‹hope and a prayer, we loaded Polly into her carrier without a fight"¦ in fact, during the entire trip to the vet, Polly only made but one small peep! So, we bought Polly her own Thundershirt, and now we have three (one for each cat).

Also, the Thundershirts have helped to quash other, various misbehavior patterns: from bouts of jumping everywhere they aren't allowed and pawing like maniacs at the food/treats cabinet, to midnight racing sessions, and beyond.

Certainly, there are animals who don't/won't respond to the Thundershirt with the same about of luck. But, for our three guys, they have been key to many a cat-parenting success.

The only negative pieces of feedback I have, when taken in proportion to success rate, don't demerit a full star"¦ but maybe a half a star:
1) The stitching which secures the velcro is spotty, especially in the two shirts we bought more recently.
2) The velcro itself is a little too grippy (again, the first vest we bought was closer to optimal)
3) It seems the fabric has gotten much thinner/flimsier than the first vest we bought"¦ which paired with the new, extra-grippy velcro, makes for sometimes a difficult untangle to put the Thundershirt on (as well as a harder time taking it off).

For reference, our cats weigh about the following amounts and have the following sized shirts:
Tawny: ~13 pounds, hefty-build, long and very dense fur (size: Large)
Raymond: ~12 pounds, masculine-build, long and dense fur (size: Large)
Polly: ~11.5 pounds, skinny-but-long build, very long but thin fur (size: Medium)