We currently allow guests at our holiday cottage to bring their pets (up to 2) to stay with them on holiday. Normally there's no problems with this, but we might change our minds and not allow pets. This weekend I popped in to the cottage to check it after our last set of guests had checked out. They are regular visitors and normally leave the place clean and tidy, though they do switch off the heating and leave the upstairs windows open when they depart. This is not the most sensible idea in December.
After this most recent stay they left an unwelcome present on the bedroom floor. It was a pile of dog poo.
This couple, and pet dog, book through an agency so we don't have their contact details. I'll challenge them the next time they arrive to see what is their version of the story.