This shirt does not have tags but it looks like it has never been used.

Like swaddling an infant, Mellow Shirt uses gentle pressure to calm all sorts of fear and anxiety problems.
Use for thunder, fireworks, vet visits, car travel, crating, problem barking and much more.
Made with lightweight, breathable, machine-washable fabric, drug free and comfortable for your dog.
Very easy to put on and take off, hook-and-loop fasteners make adjusting for gentle pressure a snap for most any size dog.
Size XX-Small fits most dogs under 7 pounds and with a chest circumference of 9 to 13 inches.