excited / submissive peeing ? help please

Hi
Weller is 6 months now and progressing very well on the whole. He is generally well behaved, sits on command at kerbs etc. However whenever he greets someone he pees! It's so frustrating he even does it when he has just emptied bladder. We ignore him when we come in and get guests to do the same until he calms down but it doesn't make any difference. As soon ad he is petted he pees.
This happens in and out of the house. Help please!!

Has he always done this or is it a recent thing? Has he been neutered?

I have the same problem, its SO embarrassing.
Harley is 9 months and suddenly become worse at everything, and will wee if I'm cross at him or excited if I praise him and will do it all over people's feet meaning I usually shut him in his cage when people come over.
Argh!