I don't know for sure if Finn would or not. But, I do recall one night when I was walking him in Dallas, about 3 am. There was a shady character on the sidewalk close to us and I didn't even see him at first. Finn got tense and basically kept me up against the fence to our community (I would walk outside of the fence, as that was where the grass was, between the community fence and the sidewalk and road.). At first, I didn't know what was up, but, he kept me pinned. I saw the guy, and, then I saw him cross the street. I think Finn actually intimidated him. And, once, when I was living in a house with a roommate, my ex came into the yard and didn't say anything. Finn could only tell that there was someone there, and, he started growling. Chris did the same thing that Glacier's husband did. He stopped and started talking to him. So, I know that Finn would react, but, I don't know how strongly. I hope I never have to find out!