I have had a number of experiences with aggressive dogs while working as an exterminator years ago and on the Fire Dept now. Most times they have run away when confronted or have been small enough that they could be grabbed and put somewhere safe.
I have only had to really hurt a dog one time. I had a large, what appeared to be a golden retriever mix, go after my 20lb boston terrier, who was leashed in my yard at the time. When a couple of push kicks didnt work a solid soccer kick in the ribs convinced it to leave.
I have seen a number of dogs shot on warrant services. All were pitbulls doing as they had been trained to do. For example, on one memorable warrant, upon entry the lead officer was confronted by a large pitbull. As it charged he shot it twice with 5.56 breaking its spine. It continued to try and bite the officer coming towards him using only its forelegs. He transitioned to pistol to put it out of its misery and as he went to shoot it in the head it bit the muzzle of his gun as he fired. Now it was still trying to bite him with half of its jaw gone. A shot through the top of the head finally killed it.
Come across a dog like that, good luck with the pepper spray.
- Shawn