 It's got kind of a poker on one end and kind of a feather on the other side. So it can only advance one direction. And when it advances, it can't back up. That's why veterinarian John McCormick of Hunter Animal Hospital in Utah says once a foxtail sea gets stuck in a pet's eye or foot or wherever it lands, it's got to be taken out surgically. If you notice a wound, a puncture wound in your dog's toes and they're painful about it, then that's when we have to get involved.