Thundershirt is really a patent pending design that treats dogs for anxiety, fearfulness or over excitement. The shirt supplies a gentle, constant pressure round the dog's middle. This gives the dog a sense of security like being cuddled. A sense of comfort comes from this gentle touch which, consequently, supplies a calming impact on your dog when he is anxious, fearful or higher excited. This pressure shirt is recommended by a large number of veterinarians and dog trainers.