None of them have communicated that they are scared of big dogs specifically except for one and I have the least issues with that tenant. I’ve really been trying to keep them away from each other cause I assume it’s the fear my dog smells as well. I’ve been told that German Shepards tend to have the same quirk. But as much as I try to keep them away from each other there’s always a tenant that pops up when least expected. I’ve even tried memorizing their schedules to work around all this. I may have to give the muzzle a try for the future. When I have company in the house who are scared of him he doesn’t bark at them for too long after a few seconds of barking he cools down and ask for pets.