also, whether eating or sleeping over, always tell your host family if there are any allergies or special diets they should know about. if youre vegetarian, dont show up at someones house on shabbos and epect to be served lots of the things you like unless your host knows about it.
I’ve learned to make sure either my wife or I ask any “new” guests (those we have not had before) if they have dog phobias or allergies. Phobias we can deal with – we’ll put the dog in her crate. Allergies are more difficult, but not necessarily insurmountable. We don’t have to ask about vegetarians, because one of our kids is a veggie, so there’s always plenty to choose from even for the non-meat eaters.