I've stayed at more than one hotel with my dog where we had designated rooms at the end of the hall that were used for guests with pets. There was no carpet and in one case a side door to use instead of brining pets through the main entrance. I had my room downgraded/switched once as I had reserved 1 king and not notified the hotel of the additional 4 legged guest and they switched me to one of the aforementioned designated pet rooms with 2 doubles when I checked in.