When they run after the Frisbee or a ball, they don't look where they run into. That's how Happy got his wound, just missing his eye. He was lucky, but now my beautiful boy has a scar.
edited to add: I should have said it earlier. When it happened, we thought Maggie was injured, because she had blood smeared all over her face, and neck, but we couldn't find the source on her. Then I looked at Happy, and saw blood running down his face. She must have rubbed up on him, when they fought for the Frisbee. During the next days, he scratched off the scab twice, opening up the wound again, with his usual goofy "Frisbee on his head" way of carrying it.
I still love him! ;o)