Way back in the day, I was delivering with an arm load of stuff that had a loose Jack Russell. At the time I had not learned dog's body language signals that I needed to assess a potential threat. Their dog trotted out, while the owners were at work, silently but rigid like a small furry armored car. I felt a burning sensation on my calf, like a wasp sting. I wheeled around and dropped their stuff as he released one calf and grabbed the other. I swung the Diad 1 at him, and it actually whooshed through the air, but missed him each time. He was super fast!
The owner called me at home to apologize and asked what I might "want", and I days just to never see the dog loose again, and I didn't.
I had big knots in both calves like I had been pinched with freaking vise grips!
I think I would have killed him with my bare hands of I could have caught him, but to this day I'm glad he got away. I love dogs, even dumb ones, and I did become much better at gauging their behavior after that.