“Happy Birthday” If you can't choose your favorite dog card, then why not have them all on one card?  Birthday Dogs and Cats Collection. 140 x 140mm large greeting card (blank inside) with a kraft envelope. Illustration on the front and back. about our cards. Popcorn Blue is committed to sustainability by using 100% post-consumer recycled Australian paper stock. Designed and printed in Melbourne. Made with love, passion & a splash of quirkiness.