My poodle was attacked by one of these when he was a puppy. I had never seen the breed before. We rounded a corner in a forest popular with dog walkers near here and met a couple with a female bull breed dog, smaller than a rottweiler and not as jowly, bigger than a staffy but looked similar, no Roman nose, huge across the forehead and such a wide chest. I knew from the couple's body language we were in trouble, the man reached for her harness but too late. No sooner had she seen my pup but she launched an attack. It was totally silent. She just ran at him and went for his neck. The noises he made, never heard anything like it. She never made a sound. Chilling.
There is no doubt in my mind she would have killed my dog but for the strap muzzle they had on her. She meant business. My dog hadn't approached hers or been cheeky like puppies can be. He was literally sniffing in the undergrowth when she launched at him from 10 metres away.
I will never understand why that couple, who knew their dog was aggressive to others - clear from their body language when we rounded that corner, the way he tried to grab her, and the fact they had her muzzled - also had her off lead.
That dog was dangerous and if she hasn't killed another dog between then and now it's by luck alone.
We have met other reactive dogs, other grumpy dogs, dogs who have growled. Dogs who have warned ours off, and dogs who he, as he has got older, has warned off too. I have never seen another silent attack like that bully. I can only liken it to when my dog stalks squirrels, but without the initial still, step by step stalking period. Straight into the silent attack phase.