How It Works

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 Velcro 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.

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 Velcro 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.

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

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

For selecting the correct size, your dog's chest size is the best measurement to use. If not available, your dog's weight may be used as a guideline.

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.