I doubt that the licking will do anything. That wouldn't concern me apart from the fact that I find it odd to let a dog lick your face. I know a lot of people do it but it's a choice I wouldn't personally make.
As for poop, it is possible for poop to carry parasites like giardia, which can be passed on to humans if you handle to poop or the grass where infected poop has been.
As for poop, it is possible for poop to carry parasites like giardia, which can be passed on to humans if you handle to poop or the grass where infected poop has been.