My dad did that, and he kept barking. But he did sniff him, and got a bit used to him. I'm using the bottle rattle trick, but at times he jumps for it and I tell him no.

I don't want to upset him or anger him too much, because in weather like this people get angry, all hot and bothered and dogs can turn (I heard somewhere this lady had to dogs she had for 10 years who turned on her and killed her because the heat was getting to them).