Regardless here are some action shots taken early this morning before breakfast.
(Bangsi looks much larger tan Kitty in this shot - above. He has long hair; she has short hair. He's a boy; she's a girl. They are really very close in size and weight.)
Tully and Gunnar
Dogs read body language. They read ours all the time; that's how they learn when you are getting ready to go out to run errands. They don't communicate with words but they do watch humans and other dogs carefully. Sometimes our dogs see something in other dogs that warns them they might not be friendly. Trust your canine companion's instincts like you've learned to trust your own instincts - even if you don't know 'why' someone seems suspicious or another dog seems threatening, there is usually a good reason for that feeling you get - that feeling that your dog gets too. Take protective measures if you get that funny feeling.