Using this dog T - shirt is easy. Just slip it over your dog's head and adjust it to fit comfortably. When choosing a size, make sure to measure your dog's chest and length to ensure a proper fit. As for maintenance, you can machine - wash it in cold water on a gentle cycle. Avoid using bleach or harsh detergents as they can damage the fabric and the print. Hang it to dry instead of putting it in the dryer to prevent shrinking. Also, keep it away from sharp objects to avoid tears. This T - shirt is officially licensed, so you can be sure of its quality and authenticity.