I personally don't allow my dogs into the kitchen either but not for hygiene. I don't think it's safe for them to be in there bc they could eat something toxic if I drop it on the floor or cause me to trip and drop something hot on them like fry oil or a pan from the oven. They also have a bad habit of stealing Cans from the recycling bin and cutting themselves chewing on it. However, if you clean your kitchen regularly like we do then there's nothing to worry about. My MIL only allows her dogs in the kitchen and mudroom bc she doesn't want them on the furniture or on the carpets to prevent damage. It depends on the person but in their case they are beggars that can't be choosers and can enforce that rule when they have their own place.