CafePress makes the perfect Happy Birthday Pet Apparel for your pup. Our doggie shirts come in thousands of designs sure to fit any personality. Show off your family is getting an addition with our unique big brother dog shirts and big sister dog shirts. Our best sellers are funny dog t-shirts that really express everything they want to say to their humans. Buy a variety to make dog outfits for every season and occasion because clothes for dogs will never go out of style. Sizes range from large Labrador Retriever dog shirt sizes to small Chihuahua dog shirt sizes. For mixed dog breed families, we offer matching small dog clothes and big dog clothing so the whole family can enjoy that special occasion in matching shirts. CafePress dog shirts are machine washable and durable for everyday wear to the dog park or doggie daycare. These dog clothes also make good puppy shirts, cat shirts, and ferret shirts. Good to know all our companions can dress up in these completely unique and funny dog shirts. Sure to make everyone jealous.