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thundershirt overview

ThunderShirt's patented design applies a gentle, constant pressure that has a dramatic calming effect for over 80% of dogs.

  • Most effective anxiety solution as voted by veterinarians
  • Already helping hundreds of thousands of dogs and cats across the country
  • Great for storms, separation, travel and many other anxieties
  • No need for training or medication

how thundershirt works

ThunderShirt uses gentle hugging to calm your dog or cat. With its patented design, ThunderShirt’s gentle, constant pressure has a dramatic calming effect for most dogs and cats if they are anxious, fearful or overexcited. Based on surveys completed by over two thousand customers, over 80% of dogs and cats show significant improvement in symptoms when using ThunderShirt. ThunderShirt is already helping hundreds of thousands of dogs and cats around the world and is recommended by thousands of veterinarians and trainers. How does ThunderShirt work? Experts believe that pressure has a calming effect on the nervous system, possibly by releasing a calming hormone like endorphins. Using pressure to relieve anxiety in people and animals has been a common practice for years. Below are several examples.

how thundershirt work

ThunderShirt helps keep animals calm so they are more comfortable in situations that were once frightening.

parents use swaddling to calm and sooth an inconsolable infant

Wrapping a baby snuggly in a blanket, or “swaddling”, is a very common practice for helping to calm an irritable or upset baby, or to help a baby to fall asleep. Medical professionals today routinely teach swaddling to new parents, and families and friends have been passing down this wisdom for centuries. Some experts believe that swaddling mimics the warmth and pressure babies experience in the womb. But whatever the reason, there is no denying its success!


Parents have been comforting and soothing their babies with the gentle pressure of swaddling for centuries.

people with autism use pressure to relieve their persistent anxiety

Many people with autism suffer from persistent anxiety. Dr. Temple Grandin realized that applying gentle pressure around her torso provided wonderful relief for her, and this led to the design of her “Hug Machine”. Now thousands of people with autism routinely use pressure to bring comfort. Over the years, it has also been learned that this kind of pressure can help with a wide variety of behavioral issues for both adults and children. “Pressure Vests” and “Weighted Vests” are routinely used by special needs teachers to provide calming and focus in a wide variety of circumstances.

ttouch® trainers use pressure to address a wide variety of animal anxieties

For many years, Tellington TTouch Trainers have been using pressure with dogs and other animals to help with a wide variety of issues, including fear of noises and separation anxieties. Prior to ThunderShirt, they frequently wrapped ace bandages around dogs and cats to achieve this pressure, but this was frequently very difficult to apply and unsafe to leave on an animal when unsupervised. Now most TTouch Trainers are using ThunderShirts because of their ease of use and safety. And ThunderShirts look great! As a component of TTouch Training, ThunderShirt is helping families, veterinarians and trainers increase an animal’s self-confidence, providing comfort in situations that were once frightening or stressful.


thundershirt step by step

Before putting ThunderShirt on your dog for the first time, we recommend offering a small amount of food to your dog using the ThunderShirt as a "plate". Dogs typically become more comfortable and trusting of something that "brings" them food or anything that they associate with food. So this is an easy little trick to quickly create a positive association with ThunderShirt for your dog.

ThunderShirt has been developed to be very easy to put on. Just lay it over your dog's back and secure with the chest and torso straps. The fasteners make ThunderShirt very adjustable to many different body shapes. See the illustrations and video for more information about how to put ThunderShirt on. Or click here for the instructions included in the packaging.

instructions for heather grey thundershirt

step one

Place the ThunderShirt on your dog's back and wrap the Short Flap under the torso.

step two

Wrap the Long Flap under the torso and secure with fasteners onto the short flap. Make a comfortable, but snug, fit. You should be able to easily slide your fingers between the ThunderShirt and your dog's torso.

step three

Wrap the Top Flap down onto the Long Flap and secure with fasteners. Adjust to improve the snug fit and keep ThunderShirt securely in place.

step four

Wrap the Neck Straps around the front of the dog and secure with fasteners. You should be able to easily slide your fingers under the Neck Straps and should not feel restricting around your dog's neck.

instructions for pink/blue polo thundershirt

step one

Lay the ThunderShirt over the back of your dog with the logo facing up. Lightly wrap the Neck Straps around the front of the dog and secure with fasteners.

step two

Lift the Short Flap up and lay over the back of the dog. Pull the Long Flap under the torso of the dog and secure onto the Under Flap with fasteners.

step three

Wrap the Short Flap down onto the Long Flap andsecure with fasteners. Adjust for a comfortably snug fit as necessary.

Wearing ThunderShirt for Extended Periods of Time: Thundershirt is designed to be safe to leave on for extended periods of time when appropriate for the situation or issue. When properly sized and properly put on with a comfortably snug fit, your dog should be very comfortable. If your dog will be wearing a ThunderShirt for more than two hours at a time, we recommend removing the ThunderShirt every one to two hours during the initial periods to check for any signs of irritation points. Irritation points are very rare, but it is best to be cautious.

why are dogs afraid of thunder and other noises?

According to our research, dog thunderstorm anxiety or fear of noises can arise from a variety or combination of factors. Some dogs have suffered a traumatic event involving loud noises or lightning strikes that creates a historic "trigger" for them to become anxious. Some dog breeds may have a genetic predisposition towards noise anxiety while some studies suggest that storm or noise anxiety could be a result of aging or hearing loss. No matter the specific cause, the need to relieve your dog’s fears becomes clear when your dog hides, shakes, or worse every time a storm rumbles.

symptoms of dog thunderstorm anxiety

The symptoms of noise anxiety range from mild to severe. Milder cases can include shaking, panting, hiding, barking, yawning, licking and clinging during the noise. More severe cases can include bolting, running, anxious pacing, chewing, defecating indoors, jumping through a plate glass window or even seizures. Recognizing and treating noise anxiety can be critical for the health and well-being of your dog. Based on our survey of over 2,000 dog owners in the United States, over 17% of all dogs suffer from fear of thunder or some other noise.

stories from dogs with storm anxiety

“We have an 80 lb. Boxer with degenerative disc disease. This boy is totally bizarre in a thunderstorm. Panting, attempting to get in the bathtub, very stressed! Plus, we live at the beach – a lot of summer storms. What a different dog when we put on his ThunderShirt! We have had it 3 weeks and this is a happy fellow. We were on the screen porch last night in a storm and he slept through it. I woke him when I was ready to go in. I am ordering a second! We cannot recommend it enough to friends and family!”

Owner: Catherine H. Myrtle Beach, SC
From: Dog Owner
Issue(s): Noise Anxiety

help for your dog’s fear of thunderstorms – the thundershirt

If your dog is frightened of thunder or other noises, you should try a ThunderShirt. Fortunately for us, thousands of vets agree – our ThunderShirt is the easiest, safest solution for noise anxiety. ThunderShirt calms your dog with a gentle, calming pressure that likely releases a calming hormone like endorphins. It’s like a “hug” for your dog and allows most dogs to help them ride out storms calmly and contently. Hundreds of thousands of dog owners have experienced the dramatic relief for their dogs and themselves!

the easy, natural solution – no medications and no training needed

Unlike with medications, your dog will not be sedated, risk unwanted side effects, and you won’t be making frequent vet visits for expensive prescription refills. You simply place the ThunderShirt on your dog before a storm or other noise event. He or she will likely remain calm until the last rumbles have finished. And ThunderShirts are not just for Thunder! We’re helping dogs and their families improve their quality of life for many different anxiety, fear and over-excitement issues. Whether you have a rescue dog, a shelter dog, or a new puppy, ThunderShirt can really work to improve your dog’s life and yours.

what is dog separation anxiety?

Leaving your dog or puppy home alone is never easy, but for many dogs, separation from their families can cause severe anxiety and real problems. Veterinarians and trainers call this condition “dog separation anxiety.” Based on our survey of over 2,000 dog owners in the United States, over 13% of all dogs suffer from separation anxiety. And the consequences can be severe for your dog, your family and your property.

symptoms of separation anxiety in dogs

According to our surveys and other sources (such as the ASPCA), separation anxiety affects older dogs and puppies alike, and can include a wide variety of symptoms such as indoor urination, defecation, destruction of furniture, barking, howling, chewing, digging, escape attempts and other anxious behaviors. Some dogs express it as restlessness, an attempt to keep you from leaving, or the appearance of general depression. It’s heartbreaking to know that your dog is suffering while you are away, but separation is an unavoidable reality for most families. Thankfully, there are solutions to try.

stories from dogs with separation anxiety

“We found Popeye running down the street in our new neighborhood and took him in as a foster until he can be adopted out. It became apparent that he suffers from extreme separation anxiety. He destroyed blinds, doors, baseboards and walls. He has managed to escape from every crate we tried, hurting himself in the process. His anxiety quickly transferred to the rest of my family, never knowing what we were coming home to was taking its toll. We tried herbal remedies, Prozac, sedatives, diet changes, distractions, kongs, TV’s and training – nothing worked! Then we invested a measly $40 in the ThunderShirt and our entire lives have changed. The difference in his demeanor was immediate. We can now leave our house in peace knowing that it will look the same when we get back. Even more importantly, Popeye is set up for success when we manage to find him a lucky forever family.”

Owner: Leanna T. Arizona
From: Dog Owner
Issue(s): Separation Anxiety

treating dog separation anxiety with thundershirt

The ThunderShirt is the easiest, safest solution to try for your dog’s separation anxiety. ThunderShirt works by applying a gentle, calming pressure around your dog’s torso. It’s like a “hug” and relaxes most dogs. We developed the ThunderShirt initially to treat dogs who were dangerously terrified of thunderstorms, but we’ve seen tremendous success for separation anxiety. We’ve helped many thousands of dogs to cope with their families being away with a very high success rate. Simply wearing a ThunderShirt helps most dogs to reduce or eliminate any anxiety. It really can be that simple.

the easy, natural dog anxiety solution -- no training needed

Unlike with medications, your dog will not be sedated or risk unwanted side effects, and you won’t be making frequent vet visits for expensive prescription refills. With a ThunderShirt, just put it on and you likely will come home to a happier, calmer dog. Whether you have a rescue dog, a shelter dog, or a new puppy, ThunderShirt can really work to improve their lives, and yours.

what is car travel anxiety?

While many dogs enjoy car rides, for some others, a car ride can become a trip of anxiety or over-excitement. According to our survey of over 2,000 dog owners across the United States, over 5% of dogs suffer from issues during travel. These issues can create real problems for taking your dog to the veterinarian, the groomer, or anywhere involving a car trip. Many dogs are so fearful of traveling, that even getting them in the car can be a struggle. Other forms of travel are also difficult for many dogs. Air travel in particular can be a very traumatic event that often requires heavy sedation.

Symptoms of Dog Travel Anxiety

Car travel anxiety can present itself in many ways such as carsickness, barking, whining, pacing, scratching and restlessness. Many dogs become dangers to themselves and others by jumping on the driver or otherwise distracting concentration from the road. Like other forms of dog anxiety, these symptoms can often result in injury to your dog, damage to your property, and expensive cleaning and repairs. These negative travel experiences can also compound the fear a dog already feels toward vet visits and groomer visits.

stories from dogs with travel anxiety

“Hi, My name is Buddy. I’m a former medical research beagle who gets so car sick that the only thing that works for my nausea is Cerenia (prescription). Every time we go to our cabin in the mountains, I have to take Cerenia in order to survive the trip. Well, here’s good news for all of us who struggle with doggy motion sickness. I now have a ThunderShirt. I thought it was just some crazy shirt I had to wear to look cute. Well, let me tell you, I love it. Now I can travel drug free. I feel much better about going in the car, where I hunker down and sleep most of the way. ThunderShirt works for me. No vomiting, no restlessness, no pooping, no anxiety. ThunderShirt works for me. Now my sister beagle is wearing one too. We former research doggies are anxious about pretty much everything. Thanks, ThunderShirt, we appreciate you.”

Owner: Cathie, California
From: Dog Owner
Issue(s): Travel Anxiety

Help Your Dog Be Calm and Fearless During Car Travel

If your dog exhibits any of the symptoms of travel anxiety, we have a proven solution to try. ThunderShirt has helped many thousands of dogs to become happy and safe travel buddies. Many dog owners that have previously been forced to use sedatives for their dogs during travel, are now able to travel “drug free”! ThunderShirt is a solution that is recommended by vets because it is safe and requires no medication or training. Read Why It Works.

The Easy Dog Travel Anxiety Solution – No Medications and No Training Needed

Simply put the ThunderShirt on your dog and observe the incredible difference during your next car trip or visit to the vet or groomers. The gentle pressure of ThunderShirt gives your dog the sensation of “hugging" which calms the dog. Many dog owners have reported how their dogs that previously went berserk and barked for the entire car ride now, with a ThunderShirt, lie down and even enjoy the trip! Unlike with medications, your dog won’t be sedated, and you won’t be making frequent vet visits for expensive prescription refills. We’re delighted to help improve the quality of life for dogs and their families.

thundershirt success stories

testimonial pic HOLY COW!!!! We have had 6 English bulldogs. Never before did we have a "barker". NOTHING had worked. I bought the ThunderShirt at Pet Supermarket yesterday and we are ASTONISHED! Coco actually looked relaxed with it on. None of her usual "triggers" caused barking . Now, just please make one in a light weight fabric for those of us in south Florida. I have already recommended it to my Friend on FB!

testimonial pic We’ve been using ThunderShirt at my clinic, and the feedback from our clients is very positive. ThunderShirt is a good alternative solution to try versus medications. And it will definitely ‘Do no harm’.

testimonial pic I have used ThunderShirt with my own dog and have seen a real improvement with her fear of thunderstorms and other loud noises. I am now recommending ThunderShirt to my clients with good results.

testimonial pic Our dog Roxie has always had some form of anxiety since she was given to us. For some reason she would do constant licking. Recently we were on vacation for over a week, but spent time in and out of the house. For some reason this triggered constant shaking and panting, even in the house. We took her to the vet and they said it was anxiety and gave us meds that helped some. I bought the ThunderShirt too and now she’s much better.

Why does Thundershirt work?

ThunderShirt’s patended design is a pressure wrap that applies a gentle, constant pressure on a dog’s torso. From real world experience, we know with certainty that ThunderShirt DOES WORK. That is why we are able to offer a money-back guarantee. A survey of ThunderShirt users shows that over 80% of dogs show significant improvement in at least one anxiety symptom when using ThunderShirt.

According to some experts such as Dr. Temple Grandin, pressure has a calming effect on the nervous system. Using pressure to relieve anxiety has been a common practice for years. For example:

  • TTouch dog trainers use pressure to address a variety of anxieties.
  • Veterinarians use pressure to relax cattle when they are administering vaccinations.
  • Some autistic people use pressure to relieve their persistent anxiety.

Until now, there just hasn’t been a well-designed, inexpensive pressure wrap commonly used for canine anxiety.

Why doesn’t my vet know about this remedy for anxiety and fear issues?

Good question! With millions of dogs suffering from anxiety, it amazes us that such an easy to use, inexpensive solution like ThunderShirt isn’t more widely known and used. ThunderShirt is working to change that; we have launched an outreach campaign for veterinarians. If you would like us to speak with your veterinarian, please contact us.

What training is required for using ThunderShirt for anxiety and fear issues?

For many types of anxiety no training is necessary! Just put ThunderShirt onto your dog and you will likely see results with the very first usage. However, for some dogs, it may take two to three usages to see results. For some more serious anxiety cases, such as severe separation anxiety, you should consult a good trainer for how to integrate ThunderShirt into a training program.

What if Thundershirt isn’t working for my dog?

We stand behind our product! ThunderShirt is a terrific solution for most dogs suffering from anxiety. Many owners see reductions or complete elimination of symptoms with the very first use. With others, it may take two or three usages of ThunderShirt to see results.

But if for any reason ThunderShirt isn’t the right solution for your dog, return it within 45 days for a full refund of your purchase price (less S&H). See below for detailed return or exchange instructions.

How do I return my Thundershirt for the money-back guarantee?

If you purchased your ThunderShirt from another retailer:

Please return your ThunderShirt to the place of purchase for credit; we are unable to process returns for ThunderShirts not purchased directly from ThunderWorks Company. If the place of purchase is unwilling to support the refund policy, please contact us at

If you purchased your ThunderShirt directly from ThunderWorks Company:

We stand behind our product! If for any reason you decide that the ThunderShirt is not the right solution for your dog, you may return it within 45 days for a refund of your purchase price. To ensure we are able to process your return efficiently, we will provide you with a return label for your package.

Please contact ThunderWorks for your return label by emailing us at (Please Include order#) or you can Live Chat with us by clicking on the Live Chat link on top of this page. You can also call us at 866-892-2078, and press 3 for customer service during business hours 8:00 am-5:00 pm Eastern Standard Time.

Return Process:

Once we review your order history and confirm that you are still within your 45 days, we will email you a return label that you can use to return and track your package. When we receive your package, a credit for the original purchase price of the product, less $5.95 for return shipping, will be issued to your credit card within a week. In the event that we cannot process a credit, a check will be mailed to you.

If your return is due to product defect or shipping error ThunderShirt will provide you a return label at no cost.

Embroidered ThunderShirts: Because embroidery is customized we do not offer a money back guarantee, returns or exchanges on these products.


How do I exchange my ThunderShirt for a different size?

If you purchased your ThunderShirt from another retailer:

You will need to exchange the ThunderShirt at the place of purchase, as they received your payment. All of our retailers are aware of, and should abide by, our 100% satisfaction guarantee. You may need contact the place of purchase directly to find out their exchange procedures.

If you purchased your ThunderShirt directly from ThunderWorks:

If you believe that you may need a different size ThunderShirt for your dog, we will be happy to exchange it. Please send it back with the pack sheet or order number with a note stating the new size you’d like to: ThunderShirt Customer Service, 905 Jackie Robinson Drive, Durham, NC 27701. Please note that an additional charge of $10 will be applied if you are exchanging an embroidered ThunderShirt. We donate returns and exchanges to rescue groups and shelters. The returned ThunderShirt will be put to good use!

Can I wash and dry ThunderShirt? Remove hair from fastener hooks?

ThunderShirt is made with durable, washable fabric. When necessary, ThunderShirt may be washed in a regular cycle using regular laundry detergent and cold water. Hang to dry.

If necessary, to remove dog hair from your ThunderShirt’s fastener hooks, we recommend using a standard dog “slicker” brush (Available at most any pet store for as little as $2.99). A couple of strokes and the fastener hooks will be nearly completely hair-free.

How long can I leave a ThunderShirt on my dog?

ThunderShirt is designed to be safe to leave on your dog for extended periods of time when appropriate for the situation or issue that you are addressing.  ThunderShirt is made out of light-weight, breathable fabric, so over-heating is very rarely an issue.  When properly sized and properly put on with a comfortably snug fit, your dog should be very comfortable for extended periods. Some customers allow their dog or cat to wear their ThunderShirt for 8-10 hours per day while at work. It is typically safe to leave a dog unsupervised while wearing a ThunderShirt.  If you will be allowing your dog to wear a ThunderShirt for extended periods (e.g. over 2 hours), during the initial periods, we do recommend removing the ThunderShirt frequently to check for any signs of irritation points.  Irritation points are very rare, but best to be cautious.

How do I put ThunderShirt onto my dog?

We designed ThunderShirt to be very easy to put on your dog, even if she is already in a state of anxiety. Click here to see detailed illustrations.

Are there any special sizing and fit considerations for male dogs?

When fitting a ThunderShirt on a male dog, the straps that go around the stomach area should not cover or push on the genitals or prepuce.  If the ThunderShirt rubs against the genitals or prepuce, irritation may result. 

What size is right for my dog?

sizing chart

Metric Sizing Chart

metric-sizing chart
sizing chart

Measure “Chest Size” as illustrated by red arrow below

ThunderShirt comes in seven different sizes... XXL, XL, L, M, S, XS, and XXS. See the table to find the right size for your dog. Like people, dogs come in many different shapes and sizes, so if your dog has unusual proportions, you may need to go up or down a size versus the “standard” measurements. But the ThunderShirt is designed to be very adjustable to accommodate different dog shapes and still be easy to put on.

Is overheating a concern when using a ThunderShirt?

Except in extreme conditions (e.g. 90 degrees Fahrenheit in the sun), overheating is not typically a concern when using a ThunderShirt. Dogs cool themselves primarily through their mouths and paws, and a ThunderShirt is constructed of a thin, breathable fabric. In fact, the state of Florida is one of our biggest markets. But if you feel that overheating might be a problem for your particular circumstance, please monitor your dog for any signs of overheating such as heavy panting or tongue hanging out of the mouth. Remove the ThunderShirt if you see any signs of overheating.

How do I contact you about my ThunderShirt?

For customer support on how to get the most out of your ThunderShirt, see the below:

  • FAQ... Many questions are addressed in our detailed FAQ section.
  • Email... Send us an email at and we will respond within one business day.
  • Phone... If you prefer, call our customer support line at 866-892-2078. Our representatives are available Monday through Friday, 8:00AM to 5:00PM Eastern Standard Time.