That's very funny. Everyone is running to check their dog's ears. I got another input from another source: A lady who heads up a Beagle Rescue Club told me that, Yes - all beagles have them. She wasn't sure if and how many other breeds may as well. She also says that she even suses this trait to identify a supposed purebred. If she receives a new rescue and it doesn't have this flap, she generally classifys it as a mix. FOR WHATEVER'S IT's WORTH!