I'm The Birthday Boy - Dog Shirt Dog in the Closet, I'm the Birthday Boy - Dog Tank, XS Royal Blue Rhinestone dog t-shirt for big and small dogs 4" X 4" design with clear, blue, & gold rhinestones & rhinestuds. 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.