We have a lovely 11 week old lagotto pup, who is doing beautifully. I take him to my parents' house every day to say hello (on our walk - they live close by). He is mad about them, and when they answer the door he leaps about madly and wees everywhere. This also happens when they pop over here, especially with my DF. He never does it with anyone else. My folks are very calm when greeting him, but is there anything in particular we can do about this?