Here's my first line of home defense.
We rented a house to a young woman veterinarian. She said she had a Boxer. I went over there to show her the place and she had a brindle Pit that looks a lot like yours. I just smiled and said, "That's a stocky looking Boxer".
But the dog seemed okay, so I didn't push it.
Besides, they seem like good renters. The woman is a Vet and her boyfriend is a crew leader for a tree cutting place.