The last couple of times I've taken Willoughby to my daughters house he's weed on the carpet. It's not as though he doesn't know where the door is to go out or even desperately needs to go. Her MIL's springer visits the house but has never weed inside just in the garden. He never does this at home and it's a bit embarrassing. We take him other places and he's fine. Any ideas how to stop him? We are supposed to be all visiting Christmas Day and I don't want him being a nuisance.