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Thundershirt’s gentle, constant pressure has a dramatic calming effect for most dogs if they are anxious, fearful or over-excited. Over 80% of dogs show significant improvement in symptoms when using Thundershirt.

Experts believe that pressure has a calming effect on the nervous system. Using pressure to relieve anxiety has been a common practice for years. For example:

  • Veterinarians use pressure to relax cattle when they are administering vaccinations.
  • People with autism use pressure to relieve their persistent anxiety.
  • Parents use swaddling to calm an inconsolable newborn infant.

Before putting Thundershirt on your dog for the first time, it is recommend to offer a small amount of food to your dog using the Thundershirt as a “plate”. Dogs typically become more comfortable and trusting of something that that they associate with food.

Thundershirt is easy to put on. Just lay it over your dog’s back and secure with the chest and torso straps. The Velcro fasteners make it very adjustable to many different body shapes.

Most dogs respond with first usage; some need 2-3 usages before showing significant improvement. If you are aware of a noise trigger coming (e.g. thunderstorm on its way), put your Thundershirt on your dog prior to your dog becoming anxious.  Many dog owners will put their dogs in their Thundershirts prior to going to work if a storm is forecasted during the day. 


Size     Chest size
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.
How to Measure Chest Size

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