It would help so much if hotels and trip advisor would start listing as an amenity PET FREE. I am deathly allergic to pets. I almost wound up in the hospital last summer after staying at a Plymouth, MA hotel that is part of a well-known popular chain. While I was told I was on a pet free floor, clearly there was pet dander all over that room. It doesn't matter if a hotels says they have "pet free" floors if they have a central HVAC system or if housekeeping vacuums a pet room and then uses the same vacuum cleaner to "clean" a pet free room and blows dander all over the room. The windows in that hotel so not open so I had no way to air out the room. Do we all really want to stay in rooms where someone else's dogs have crawled all over the bedding, furniture and carpets? Yuck! Please, show me the PET FREE hotels.