i opened the door one day on the way out to a football game and the littlest took off for the hills!!! (i really need to take him out more often so he doesn't act like this!) he slid right into the concrete and got a nasty brush burn on his arm! what made it worse was that he kept pulling the scab off and it bled continuously for about four days!!! the little monster is actually the little rubber tabs you put on your keys to distinguish them from one another. i bought a pack of them and my husband HATES 'em so i HAD TO find another use for them...right?!?!? TFL!!!