I have had, 2 Rottweiler’s, 3 German Sheppard’s and a bullmastiff as guard dogs. Never had any problem with any. I used to leave the yb out all day with the door open when I went to work, [wouldn’t do it now because of the hawks] dogs would go in the lofts it never bothered the birds, it’s how you train them. When I was younger I had tumblers in my nanas back garden she had a cat it never bothered the pigeons again it used to go in the shed. It’s like I said how you train your animals.