How can I word asking this guy I'm dating to not kiss his dog?

Ok so this guy I have been dating for about a month loves his dog so much that he lets his dog lick his face. That bothers me for when we kiss, I don't want to be swapping saliva with the dog. Is it manipulative or controlling of me to ask him to stop that. We just started kissing but I could say something like we don't have to kiss if he doesn't want to stop that but I feel like that would be a very mean thing to say since we just had our first kiss a week ago. Like I feel like it's messed up to take away the kissing when we just had our first kiss. I could instead kindly/politely/respectfully ask him to stop. But I don't know how to word it. Is it controlling or manipulative of me to ask to stop that you think? Or is it normal? I'm just trying to set a boundary because that disgusts me beyond belief however I like this guy and I don't want to let him go before giving him a chance to change his behavior.

How can I word asking this guy I'm dating to not kiss his dog?
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