So many diseases can be spread on your shoes.....LIKE PARVO! I dont put my girl down on their floors, unless she is on a potty pad, which I bring in with me......for fear, that even though she has had her shots.......I dont want ANY diseases.......
And regarding the lady who "expected" clean up? Well, I would of purposely handed her a towel, and let her know I thought she might need that to clean up after HER dog....LOL