My Poor Baby

We were at Grandma's house with the dog's riding in the back of my truck (it's all on the same farm). I have an extra cab chevy with the back doors that open backwards. I was putting stuff in the back seat and my sweet pup Dollie was leaning out over the edge of the truck bed, trying to see what I was doing. When I shut the back door I heard this weird screaming sound. I looked to see what the heck it was. Dollie had her lip stuck in the crack of the door, where the hinge would be. It took me a second to figure out what the heck was going on and open the door again. Poor dog I tried to comfort her, but she just wanted to play. There wasn't any blood or swelling. What are the chances?