Size doesn't matter when it comes to fear and anxiety. It can affect a 9-pound Chihuahua just as easy as Thor, a 130-pound Great Dane. Strangers scare Thor, and he responds by growling, barking, and lunging at them. He did it to me when I met him today and, let me tell you, it's a bit intimidating! But we took our time and fed him his favorite - peanut butter - and by the end of our session we were buddies. We will work to do the same with other people he doesn't know.
Jeff Dentler, CPDT-KA, IAABC-ADT, FFCP, CTDI