I'm The Big Sister - Dog Shirt Dog in the Closet, I'm the Big Sister - Dog Tank, 3XL Black Rhinestone dog t-shirt for big and small dogs 6' X 5" design with silver, pink, blue, & green nailheads. Please use our size chart when selecting correct size. There are no standard sizes for dog clothes so every manufacturer has their own size chart. Our size chart is the size of the tee - not the size of the dog. So you will need to adjust the width for the comfort of the dog.