Frequently Asked Questions

All of ThunderWorks' solutions are designed to be simple, effective, and safe for many of the most common problems faced by families with dogs and cats. Below you will find answers to some of the common questions we receive. If your question is not addressed below, contact us.

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Why does ThunderShirt work?

From real world experience helping millions of dogs and cats, we know that ThunderShirts help for over 80% of cases. That is why we can offer a money-back guarantee. ThunderShirt's patented design applies a gentle, constant pressure on a dog's or cat's torso. Using pressure to relieve anxiety has been a common practice for years. Prior to ThunderShirt, there just wasn't an easy and safe way to do so for our dogs and cats. It is believed by many experts that this type of pressure works in a similar manner to swaddling an infant or people with autism using pressure to reduce persistent anxiety. To learn more about the science, please click here.

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

Good question! With tens of millions of dogs and cats suffering from anxiety, we are striving to build awareness of this simple, safe, inexpensive solution. We attend many veterinarian continuing education events and other vet forums every year. ThunderShirts were ranked the most effective solution for anxiety by veterinarians in a 2011 survey. Thousands of veterinarians recommend ThunderShirts around the world. If you would like us to speak with your veterinarian, please contact us.

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

For many types of anxiety or fear issues, no training is necessary! Just put ThunderShirt onto your dog or cat and you will likely see results with the very first usage. However, for some, it may take two to three usages to see maximum 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.

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What if ThunderShirt isn't working for my dog or cat?

We stand behind our product! ThunderShirt is a terrific solution for most dogs and cats 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 or cat, return it within 45 days for a full refund of your purchase price (less S&H). See below for detailed return or exchange instructions.

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

We stand behind our product! If for any reason our ThunderWorks product isn't the right solution for your dog, please contact us within 45 days of the date you received your product. If your product is in good condition, we ask you donate the ThunderWorks product to your local shelter or rescue. Make sure you obtain proof of donation, this information should be emailed to us at service@ThunderShirt.com. Once your donation has been verified, your refund will be processed and a credit will be automatically applied to your credit card or original method of payment within 7 days. Please note that depending on your credit card company, it make take an additional 2-10 business days after your credit card is applied for it to post to your account. As a part of our 45-day return policy, all returns will need to be received and processed within 45 days of received date. If you purchased one of our ThunderWorks products from a retailer, please return the product to the retail location, not to ThunderWorks, for a refund. We do not accept returns not purchase from our online retail store.

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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 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.

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How long can I leave a ThunderShirt on my dog or cat?

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 Thunder- Shirt for more than one hour at a time, we recommend removing 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.


NO EXPOSED HOOK FASTENERS: When properly sized and put on your dog, no sections of “hook fasteners” (the side of the fasteners that feels rough to the touch) should be exposed on the outside or against your dog’s fur. If you see exposed hook fasteners in either place, please remove the ThunderShirt and contact us at service@thundershirt.com or 866.892.2078.


CHEST STRAPS SHOULD BE LOOSE AROUND NECK: Use the “two- finger” collar rule when applying the neck straps (i.e. easily slide two fingers between the neck straps and your dogs neck without pressure). The neck straps are only intended to keep the Thunder- Shirt in place.

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How do I put ThunderShirt onto my dog or cat?

We designed ThunderShirt to be very easy to put on your dog and cat, even if she is already in a state of anxiety. It just takes a few seconds and is very easy to adjust for proper fit.
How to fit your dog (Classic) How to fit your dog (Polo) How to fit your cat

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My cat seems to fall over when I put a ThunderShirt on…why?

Most cats have never had any clothing placed on them and cats are very sensitive to tactile stimulus. When first wearing a ThunderShirt, many cats do what we call the "Freeze & Flop"…. They appear to be immobilized and lay on their side. Don't worry!...They are not suffering any discomfort; many cats are actually purring while they do this. If your cat does the Freeze & Flop, simply give her some time to adjust and encourage her to move. Most cats quickly learn that they can still move freely.

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Why does my cat ThunderShirt come with a collar? How do I use it?

Our new cat ThunderShirts comes with an integrated safety collar. This collar is to be used with a leash for vet visits or other supervised times you would like to use a leash with your cat. Or even to take your cat for walk outside! IMPORTANT: The collar is not a safety collar and should not be left on your cat unsupervised; remove when not using a leash.

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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.  If you see any indications of this, remove the ThunderShirt immediately. Try a smaller size or contact us for other suggestions.

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What size is right for my dog?

ThunderShirt comes in seven different sizes... XXL, XL, L, M, S, XS, and XXS. Click the link below 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.

Click Here to View Sizing Chart

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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.

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What if I see signs of discomfort or irritation with my dog or cat when wearing a ThunderShirt?

Most dogs and cats love to wear ThunderShirts! We hear feedback from families all the time that their dog or cat literally seeks out their ThunderShirt in times of stress. When sized and put on properly, your dog or cat should be very comfortable wearing a ThunderShirt. Problems are very rare, but if you see any signs of skin irritation or physical discomfort, please discontinue use and contact us.

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Where can I find a ThunderShirt? Are ThunderShirts available in my country?

ThunderShirts are available in most pet stores across the United States and Canada. For a list of where to find ThunderShirts outside of the United States, click here.

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Is ThunderLeash a positive-based solution? Does it apply uncomfortable or painful pressure?

ThunderLeash absolutely is a positive-based solution. When properly used, it does not cause any discomfort. ThunderLeash's safety buckle ensures that ThunderLeash will only apply safe pressure to a dog's torso. The pressure is very similar to how harnesses work with Martingale loops… When a dog pulls, the loop snugs up a little, but the range is very limited. This safe pressure provides immediate, consistent feedback to the dog whenever she pulls. Perfect for combining with other positive-based training techniques for teaching proper leash manners.

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How does ThunderLeash work as a "No Pull" Solution?

ThunderLeash is a positive-based training solution. When leash pulling is a concern, ThunderLeash can be converted easily into a "no pull" harness by simply wrapping around the dog's torso using its innovative, patent-pending hardware design. The safety buckle adjusts to prevent any uncomfortable pressure for hard-pulling dogs. When a dog pulls, ThunderLeash snugs up on the torso, providing immediate, consistent and safe feedback to the dog. This feedback is excellent for combining with other positive-based training techniques for teaching proper leash manners.

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How do I put the ThunderLeash on my dog?

It takes just a few seconds! Click here for a copy of the packaged instructions for a ThunderLeash

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What size ThunderLeash is best for my dog?

For dogs under 25 lbs, we recommend our Small ThunderLeash. For dogs 25 lbs or over, please try our Large ThunderLeash.

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What training is required?

For most cases no training is necessary. Just put the ThunderLeash onto your dog and you will likely see improvement in leash pulling. The ThunderLeash can also be used in conjunction with the ThunderShirt for added benefits. For some more severe cases, you should consult a good trainer on how to integrate the ThunderLeash into a training program.

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What if the ThunderLeash isn't working for my dog?

We stand behind our product! ThunderLeash is a terrific solution for leash pulling for most dogs. If you are not seeing desired results we encourage you to review this FAQ for possible suggestions to improve your results. You may also want to try using the ThunderLeash with the ThunderShirt for added benefits. We also suggest trying the ThunderLeash at least four times before making a final decision. But if for any reason ThunderShirt isn't the right solution for your dog or cat, return it within 45 days for a full refund of your purchase price (less S&H). Click here for detailed return or exchange instructions.

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How do I contact you about my ThunderShirt?

For customer support on how to get the most out of your ThunderWorks product, see the below:
Email... Send us an email at service@thunderworks.com and we will respond within one-to-two business days.

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