Back before I was a sitter, when I asked to go inside a Rover sitter's home he explained to me that when their owner's scent is at a place, the dog is more anxious because they are constantly wondering when you will be back. This guy seemed very knowledgeable and capable and I left my dog with him several times with no issues. When I started sitting, I took his advice and have not invited owners in. The couple of times I was asked, of course I said yes, but I did notice these dogs waiting by the door for the majority of the time they were with me, as opposed to the ones I met outside who accepted my place as their new home for the time. It would be wonderful if more people were aware of this so that owner's didn't feel (understandably) suspicious about not being invited in! I think it helps that I have very clear photos of my home and good reviews, so potential clients have no reason to think I'm hiding anything and can trust that I am doing what is best for the doggies :)