much issue at all!
even if your dog has successfully met your partner a few times in your home, having your partner entering your home by himself without you can still be a very frightening experience for your furry friend, which may lead to excess barking. if so, make sure you practice this while you are around. have your partner entering the door, and then reward your dog for remaining calm. then slowly move out of sight (in another room) and repeat the same thing. you want your dog to get used to your partner entering your home even without you and learn that this is no threat to him.
depending on 