Of all the dogs we've had, only Eider, Jesse and Brant did it. In my meager experience, it is the dogs who are convinced they are not dogs who seem to do it.
A bit of a tangent, but what is it about the bathroom?? What is so darned exciting in there that they need to follow you in there EVERY TIME! They don't follow my DH in there. He can do his business in peace. Eider and Jesse BOTH have to follow me in there and it isn't a very big room! This is the first time in almost 18 yrs in this house that we've had a bathroom downstairs. I'm not used to a constant audience.
While we're on the topic of wierd things dogs do, do any of you have to let the dog out to get a drink of water? We have a full, clean water bowl in the house but they much prefer to drink out of the one outside. They'll stand at the door to go out, get a drink, then want to come back in. I stuck a bowl outside when Carter was up here for so long this summer. I'm hoping they'll drop the bad habit once the water turns to ice out there