I don't know why some people are so stupid!
What makes a person like your brother's friend think he can come into someone's house and do whatever they want to, to YOUR animals?!?!
Both of my pups do not like people running, I had a friend over with her two kids (they were 6 and 9) and they have a dog at home that is GREAT with them, but when they walked in the door, I told them NO RUNNING!!!!!! I even told them why... but what did they do....start chasing Sierra around the house (Buddy was so wigged out he was hidding) and the kids would not stop after I asked them two times, then I sai "Sierra will bite you if you don't stop" then what do you know....Sierra stopped in her tracks..turned around, curled her lip up and gave the little girl a snap right by her hand (she didn't bite her hand...just snapped near her hand, as a warning)
I looked at the girls mother (my friend) waiting for her to yell at me or Sierra, and all she said was "Serves you right!"

And that little girl has NEVER ran in my house since!