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See Size Chart Below to ensure a proper fit
| Size | Chest Size | Weight |
|---|---|---|
| XXS | 9"-13.5" | < 12 lbs. |
| XS | 13"-18" | 10-18 lbs. |
| S | 16"-23" | 15-25 lbs. |
| M | 18"-26" | 20-50 lbs. |
| L | 24"-32" | 40-70 lbs. |
| XL | 31"-40" | 60-100 lbs. |
| XXL | 38"-50" | > 90 lbs. |
Explaining how the Thundershirt works to calm a dog, experts such as Dr. Temple Grandin believe that pressure has a calming effect on the nervous system. Using pressure to relieve anxiety has been a common practice for years.
With Thundershirt's patent-pending design, Thundershirt’s gentle, constant pressure has a dramatic calming effect for most dogs if they are anxious, fearful or over-excited. It is this pressure that has a dramatic calming effect for most dogs if they are anxious, fearful or over-excited. From real world experience, we know with certainty that Thundershirt DOES WORK. That is why we are able to offer a money-back guarantee. Based on surveys completed by over 1,000 Thundershirt users, over 85% of dogs show significant improvement in anxiety symptoms when using Thundershirt.
Note: While Thundershirt ususally will reduce anxiety for any dog just by putting it on, for severe separation anxieties and other severe cases, Thundershirt should be used in combination with a training program.
| TTouch dog trainers use pressure to address a wide variety of anxieties. | |
| Veterinarians use pressure to relax cattle when they are administering vaccinations. | |
| People with autism use pressure to relieve their persistent anxiety. | |
| Children with certain behavioral problems use pressure shirts and weighted vests to relax and focus. | |
| Parents use swaddling to calm an inconsolable newborn infant. |
Until now, there just hasn’t been a well-designed, inexpensive pressure wrap commonly used for dog anxiety. Thundershirt is changing that! Thousands of veterinarians and dog trainers now recommend Thundershirts for their anxiety cases.
Thundershirt is an excellent treatment for most types of dog anxiety and fear issues. For many anxieties, we recommend just putting on a Thundershirt and observing the results (No training!). You very well may see significant improvement for noise, crate, travel, barking and others with absolutely no training. For more complicated anxiety cases, we recommend using Thundershirt as part of a behavior modification program.
One thing is for certain, for a very large percentage of dogs, Thundershirt’s gentle, constant pressure has a terrific calming effect. This has obvious benefits for most types of anxiety. But Thundershirt is also a very useful tool for managing excitability or hyperactivity with strangers, on the leash, or in a training environment. Thundershirt’s calming effect helps a dog to focus (or refocus) her energies in a more constructive direction, allowing training to be more effective.
We hear skepticism all the time."Why would a shirt help my dog's anxiety?""Is the fabric infused with a drug or does it contain magnets?"
All we can say is ...Thundershirt's gentle, constant pressure has a dramatic calming effect for most dogs. We can't say exactly why it works because scientists haven't figured it out yet, but Thundershirt is already helping tens of thousands of dogs.

Posted by Unknown on 6th May 2012
I can't believe the Thundershirt worked but it did! My dog Pete is so afraid of thunder but now he goes and sits by his Thundershirt and waits for me to put it on him, then he just lays down and sleeps! It's amazing.
Posted by Unknown on 16th Feb 2012
I bought 2 I have one that has anxiety and one hyper active. We put them on and instantly they were both calm. Now we can enjoy watching tv with them. It's truly amazing.
Posted by Unknown on 29th Oct 2011
but it's NOT going back. Just bought it this afternoon and already the firecrackers are going off and she hasn't started panting or shaking yet. WOW!
Posted by Unknown on 22nd Oct 2011
Thundershirt actually works. Sounds too simple - but, worked for us.