Taking it too far?!

We went to a friend's apartment for dinner the other night and as we were waiting for the lift, we were bemused to see a lift button with a dog picture on it. When we got in the lift, there was another button with a dog on it and a sign saying "Please press the pet button first when you are with pets". When we asked our friend what this meant, she said that if you get in the lift with a dog, you have to press the dog button which then alerts fellow lift riders that you are "with dog". They can then choose whether to get in or let the lift ride on by!