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Product Info
How to Use
Sizing Chart
Customer Reviews
Product Info
What is Thundershirt?

As seen on TV, Thundershirt is an affordable, drug-free solution for anxiety problems in dogs. Thundershirt uses gentle, constant pressure on your pet's torso (just like a constant hug) to help calm your pet. Much in the same way that swaddling comforts newborn babies, Thundershirt comforts pets and eases anxiety. Thundershirt is great for dogs with fear of thunder or fireworks (or any loud noise), separation anxiety, travel anxiety, crate anxiety, grooming, barking problems, hyperactivity, leash pulling, and even as a general training tool.

NOTE: For additional calming effect, ThunderEssence aromatherapy spray and drops are also available.



  • Helps calm your dog's anxiety during stressful situations
  • Drug-free and easy-to-use
  • Recommended and used by veterinarians and trainers
  • Over 80% of dog owners report improvement in their dog's noise anxieties when using Thundershirt
  • Great for dogs with many anxiety issues, such as: fear of loud noises, separation anxiety, travel anxiety, crate anxiety, and more
  • Use for anxiety symptoms including: Panting, shaking, drooling, barking/whining, hiding, scratching, licking, bolting, eliminating indoors, seizures and more.
  • Reflective strip for extra safety during nighttime walks
How it works:

Thundershirt uses pressure to relieve anxiety. Experts believe that pressure has a calming effect on the nervous system and have been using pressure techniques for years on both animals and humans. Like acupuncture and acupressure does for people, applying pressure to dogs has been proven to help calm them in stressful situations. In fact, 80% of dog owners who tried Thundershirt for a variety of anxiety problems noticed improvement in their dogs. Veterinarians and dog trainers use and recommend Thundershirt for anxiety, too.


In severe cases of separation anxiety, it is recommended to use Thundershirt in conjunction with a training program. 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, it is recommended to remove 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.

How to Use

For many anxieties, Thundershirt does not require any training of your dog to be an effective solution. Many dogs will exhibit reduced or eliminated symptoms with the very first usage of Thundershirt (e.g. eliminated shaking, reduced panting, etc.). Some dogs require three or four usages before they begin to show improvement.

Instructions for Initial Fitting & Conditioning:

Thundershirt is designed to be very easy to put on and take off. There is no need for pulling anything over your dog's head or threading your dog's legs through leg holes. After you first receive your Thundershirt, we recommend the following steps while your dog is NOT feeling anxiety:

  • Before putting Thundershirt on your dog for the first time, offer a small food treat to your dog using the folded 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.
  • Next, simply follow the "Fitting Instructions" below. Leave Thundershirt on for 5-10 minutes. Following these simple instructions allows you to learn exactly how to use Thundershirt while the dog is calm and helps to avoid the risk that he or she might begin to associate Thundershirt with an anxiety stimulus. It can also be beneficial to put Thundershirt on every 4-8 weeks in the absence of anxiety.

To further strengthen positive associations with Thundershirt, provide a treat to your dog each time right after you put it on. Most Thundershirt pet parents report that their dogs really enjoy wearing their Thundershirts, and many dogs even go on their own to where their Thundershirts are stored when a storm approaches or some other anxiety trigger happens.

Thundershirt Fitting Instructions for Dogs:
  • Place the Thundershirt on your dog's back and wrap the Short Flap under the torso.
  • Wrap the Long Flap under the torso and secure with fasteners onto the Short Flap. You should be able to easily slide your fingers between the Thundershirt and your dog's torso.
  • 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.
  • 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.

If your pet seems nervous or anxious when he or she sees the Thundershirt, try putting it on the ground and giving your dog a little food, using Thundershirt as a plate. This trick often works because many pets become more comfortable with and trusting of anything that they associate with food.


The fasteners make Thundershirt adjustable for many different body shapes.

Do not use!
Do not use!
Sizing Chart
Details about Thundershirt
  • Make sure your pet meets the weight requirements. (See sizing chart below)
  • Every size of Thundershirt includes fasteners to adjust to your pet's unique size and shape.
  • While Thundershirt will usually reduce anxieties in dogs just by putting it on, in severe cases of separation anxiety, it is recommended to use Thundershirt in conjunction with a training program.
  • We recommend measuring your pet's chest to ensure you purchase the correct Thundershirt.
  • Please note: Our list of recommended breeds is just a guideline, and in addition, our listed measurements differ from the measurements recommended by the manufacturer. Based on surveys that we conducted, we believe our measurements to be helpful when purchasing a Thundershirt for your dog.
Dog Sizing Chart
XS: (Chihuahua, Yorkshire Terrier, Pomeranian)
Chest Size
8 - 14 lbs
13" up to 17"
S: (Shih Tzu, Dachshund, Jack Russell Terrier)
Chest Size
15 - 25 lbs
17" up to 21"
M: (Beagle, Cocker Spaniel, Bulldog)
Chest Size
26 - 40 lbs
21" up to 25"
L: (Labrador Retriever, Golden Retriever, German Shepherd)
Chest Size
41 - 64 lbs
25" up to 30"
XL: (Mastiff, Great Dane, Saint Bernard)
Chest Size
65 - 110 lbs
30" up to 37"
XXL: (Giant dog breeds)
Chest Size
Over 110 lbs
37" up to 50"
Customer Reviews
Thundershirt is rated 3.2 out of 5 by 99.
Rated 1 out of 5 by from Didn't work for car anxiety. The thundershirt was recommended to us for our doberman's car anxiety. Whenever she travels in the car her ears stay way back and she drools terribly making a mess of anything not covered by a blanket. the thundershirt made it worse. In addition to the drooling she started to tremble. We pulled over after a few miles and took off the shirt.
Date published: 2017-05-08
Rated 1 out of 5 by from Did Not Work for My Great Pyrenees Mix I bought the XXL for our Pyr mix that is very afraid of storms ever since a tornado narrowly missed us. Unfortunately, the Thundershirt did not help relieve his angst during our next storm and I was still not able to sleep. :(
Date published: 2016-07-26
Rated 1 out of 5 by from Didn't work Does not work for my American Bulldog. It simply has no effect whatsoever. We tried to use it to calm her during a thunder storm.
Date published: 2016-03-28
Rated 2 out of 5 by from Didn't work for my border collie due to the fact the Velcro fastening scared him as much as fireworks
Date published: 2016-01-01
Rated 5 out of 5 by from Wacko Dog No More I was given a Thundershirt by a friend whose dog became "catatonic" while wearing it. She said she couldn't use the shirt on her small dog despite all the dog's neurosis. We have a Poodle/Schnauzer mix who we rescued at about 1 1/2. We trained her with a professional but she continued to be anxious, nervous, & barked at every sound. I put the Thundershirt on her and she immediately calmed down. She was almost too calm at first and would hardly move, but after putting it on her several times and cuddling with her to assure her it was OK, she now accepts the shirt. I would also put it on her to keep her calm while out on walks; kept her from pulling & barking at other dogs. Now we use a small walking harness on her which apparently reminds her of the Thundershirt. She has the same reaction of calmness when she wears the soft, wrap around hardness. Seems to have a similar effect or serves as a reminder.
Date published: 2015-12-26
Rated 5 out of 5 by from Instant Calm I was skeptical when my wife brought this home. Our Chi gets 'insane' when thunderstorms arrive. Put this on and she is almost paralyzed and doesn't do anything but lay in her bed. Now that she is older, she has dementia and is extremely anxious. She paces in circles and a lot more anxious behavior. We tried it for that and it was very effective at least 90%. She still has to take medicine daily but when it doesn't seem to work, we have the thundershirt. It is a blessing for our dog, but I've heard each dog is different.
Date published: 2015-11-09
Rated 2 out of 5 by from Useless This did not work. Have tried it several times. All my dog does is run through the house yipping while wearing it. I have a video on YouTube.
Date published: 2015-07-24
Rated 5 out of 5 by from In one word "AMAZING" I have an 11 year old Dachshund who is very timid and is extremely afraid of storms. We were giving her medication from a vet. It helped but it’s expensive and you have to take her in to get it refilled all the time, so I went on line to see what else I could give her. I even thought about Benadryl but when I read that you should not give this to a child to make it sleepy, I figured that is not the way to go. I found this site and purchased the Quiet Moments Calming Aid pills. I saw the Thundershirt and read about it. I really thought I was wasting my money but desperate to try things so I bought that too. When I got it, I put it on her and told her how pretty she was. She likes the attention but this covers her and with the Velcro thought it would frighten her. She didn’t move at first but wasn’t upset about the whole thing. Then she tried to climb in her bed and because she has “NO” legs her elbow was covered she was frustrated because she couldn’t move well. I put it on her a few days later, she doesn’t try to move but ok with the whole thing. Last night, only a week later, we had two storms over us and severe lighting and she was shaking and trying to hide. I tried to give her the pill but they are very large and once the storm starts she won’t eat anything not treats not anything. I have to force them down her throat and these are large. I even broke it up and put gravy on it. She did lick the gravy but left the pill. So I thought time to see if the Thundershirt works. I got the shirt on her and she immediately improved and was barely shaking! I put her in her bed and she just snuggled up and was very calm. I was shocked and I am so happy that I bought this. No more pills – it works GREAT. The storm when on for many hours and she remained totally calm. I know this may not work for every dog but – I highly recommend it.
Date published: 2015-07-18
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Med. size too tight for 24# poodle?

Ordered Med. size and could barely Velcro close - and had to return. Her chest size measures 22 1/2". Should I move up to a large?
Asked by: Angel
Yes, if the medium was too small for your poodle you should move up to a large size.
Answered by: Christine
Date published: 2017-12-20

I have a lab that as long as we are home he wonderful but as soon as we walk out the door he tears everything up. Would this work to stop him from missing us?

Asked by: NanaSylvia
The product is used to calm dogs who are stressed due to loud noises, separation anxiety, travel anxiety and more. We cannot advise you if it will work for your pet or not but 3.2 out of 5 customers rated that it worked for them.
Answered by: Carolyn Petmed Pro
Date published: 2016-07-29

Does the thunder shirt work for dogs that are afraid to ride in the car?

Asked by: Allie
Thundershirt will ease your dog's anxiety for many unpleasant they may have to experience like car rides, vet visits and storms.
Answered by: Laura PetMed Pro
Date published: 2017-06-14

What size is right for five pound size

Asked by: Kiddo
Hi there, unfortunately per the manufacturer your dog does not meet the weight requirements to use this product
Answered by: James PetMeds Pro
Date published: 2017-06-14

cat is in between sizes

My cat's chest size is 16.5-17 inches but he weighs 15-16 pounds. Should I go with a medium or large?
Asked by: Mack
Hi there, Great question! Double check the size of measurement however the Medium 9 - 13 lbs 13" up to 17" will be the correct size for you.
Answered by: James PetMeds Pro
Date published: 2017-06-14


can you give me the measurements for the med. and small sizes?
Asked by: Lynn
Hi there, Here is the sizing chart: Please note: Our list of recommended breeds is just a guideline, and in addition, our listed measurements differ from the measurements recommended by the manufacturer. Based on surveys that we conducted, we believe our measurements to be helpful when purchasing a Thundershirt for your dog or cat. Sizing Chart Pet Size Weight Chest Size Recommended Breed Dogs: XS 8 - 14 lbs 13" up to 17" Chihuahua, Yorkshire Terrier, Pomeranian S 15 - 25 lbs 17" up to 21" Shih Tzu, Dachshund, Jack Russell Terrier M 26 - 40 lbs 21" up to 25" Beagle, Cocker Spaniel, Bulldog L 41 - 64 lbs 25" up to 30" Labrador Retriever, Golden Retriever, German Shepherd XL 65 - 110 lbs 30" up to 37" Mastiff, Great Dane, Saint Bernard XXL Over 110 lbs 37" up to 50" Giant dog breeds. Cats: S Less than 9 lbs 9" up to 13" Small cat breeds & kittens M 9 - 13 lbs 13" up to 17" Abyssinian, Birman L Over 13 lbs 17" up to 34" Maine Coon, Ragdoll Horses:
Answered by: James PetMeds Pro
Date published: 2017-06-14

My boxer is 111 lbs. which size

boxer is larger than a normal but is all muscle and not fat at all. Should I order the XL or the XXL. He does pull when we walk because he wants to get to where more people are so he can socialize.
Asked by: RonaldJames
Thank you for your question. We suggest using the XXL Thundershirt to ensure proper fitting.
Answered by: Maureen PetMeds Pro
Date published: 2016-03-10

i have a staint bernard, but she is only 7 months old. should i buy what fits now or her potential size

Ellie is 7 months old and is approximatly 80 lbs. but she is still a puppy. should i purchase the xxl or xl?
Asked by: jatalt
Thank you for your question. It is suggested to purchase the larger size so she is able to grow into it.
Answered by: Maureen PetMeds Pro
Date published: 2015-01-15
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