Relax & Enjoy! Happy Birthday Card for Brother: This cool K-9 has a special birthday message for your brother. Kick back, relax, and enjoy the heck out of your birthday! That's good advice on every birthday; heck, it's good advice for every day! If your brother is a chill guy, loves dogs, and likes to smile-this is probably the card for you! Wish your brother a happy birthday and send this fun birthday card today.