Dogs are usually a bonus for me, but not always. My most neurotic sister has dogs I can’t stand (the dogs are small with little brains and have obviously caught her neurosis.)
Smoking is usually a deal breaker for me, but my MIL smokes like a train and is stuck in a wheelchair and relies on a cleaning woman she can’t communicate with (she is Polish and speaks neither English or Norwegian), and she doesn’t do a good job, so when I am there I am cleaning something from the time I get up in the morning, to the time I go to bed. The bedroom my son and I sleep in when there, the window is always open, in cold or warm weather and I try to keep the door shut, but when we get home, our clothes stink and go right in the wash, regardless whether they were worn or not.
If something isn’t clean at a place I stay, I clean it. (my neurotic sister’s basement where I was one night had a newly acquired cat box in it and it was disgusting, complete with maggots. I cleaned it up and when I told her about it and asked it that happened often she was so mad at me.) I wanted to take the cat with me when I left. Poor thing.
So, I guess I don’t have many rules, other than, don’t be overly sensitive if I start cleaning things and don’t take offence when I sniff things and air them out or punish your dogs for biting my son. (yes, it did, for which they promptly blamed my son.)