Thunderjackets are simply adjustable vests that give your dog a secure wrap that helps them to feel calm and secure during anxiety-inducing events like thunder, fireworks, and travel.
Put the thundershirt on the dog's back, right-side up, with the neck of the jacket facing the head of the dog. Wrap the neck flap around the front of the dog's neck and secure it gently with the velcro straps. Make sure it is not too tight or it may cause tracheal damage. Wrap the 2 torso flaps around the dog's body. One goes under the belly and the other goes over the top. Adjust the top flap to give the ideal amount of pressure to calm the dog. Never wrap it too tight or it can cause breathing restrictions and possibly injure the dog.
Remember that this wrap is a tool to help calm your dog. If used frequently before it's needed to help the dog get used to it, it may be a wonderful solution for an anxious dog.