So Rowdy is completely housebroken now, except when he sees kids, especially, or sometimes just anyone new, he immediately pees everywhere, all over the floor.  I know he's just an excited pup, but do any of you know when this will stop/what I can do about it?  Thanks.

 Thanks, those are really good ideas and I will definitely try letting him out first and preoccupying him when someone does come over.