When a client wants to pick up a dog late - say 9 or 10 pm as opposed to first thing in the morning - I think it's odd there is no pay for that entire day ... is there any system in place for half days?

I just started sitting a dog who was described as lazy and easy going. He tries to hump me constantly and when I give the command for "no" that the owner gave me, he starts barking and adopts a very aggressive posture, to the point that I am actually a bit afraid of this dog right now. He's big and he's strong. He also barks the entire time he;s in his crate, and she said he's happy in it. I am giving this a bit more time but if the situation doesn't improve I am going to have to call the owner and tell her she needs to come back from vacation and pick him up because I am not going to feel unsafe around a dog I'm sitting, nor have him barking whenever he's crated - albeit rarely. What if she won't come? I'll happily give her a full refund however that is done.