Well since we're all coming clean here...
 
 
I stepped on Maddies leg coming off of a ladder (so it was most of my weight) on the second day we had her. I run about 240 for the record and I was sure I killed her for about 2 seconds. She limped/ran away from me as I tried to grab her and hug her making me feel like even more of a monster. 
Once I finally picked her up and calmed her down I massaged her leg a bit and she made no movements or sound so I knew she was okay. Didn't make me feel like any less of a heel though. 
I'm working on the mentality of ALWAYS assuming she's right behind my feet. 
Tom