I have a dilemma that I need your guys' input on, since you all have such great advice! I am dog sitting a St. Bernard for my friend's mom for the next couple of days. I went over there today to meet him and get the routine down. He ended up biting me on the backside a couple of times, I didn't say anything because I didn't want her to feel bad about it. But she insists that he's really friendly. I have NEVER been scared of dogs before, but this made me so nervous because he's HUGE!!! And I don't know if he was maybe playing, since I couldn't see his eyes since he was behind me. Any advice on what I should do when I go over there in a few hours? Help! TIA.