My first experience with an aggressive dog was completely unexpected. I had been around Sumo, a chow, for its entire life beginning at age 6 weeks to 3 years on a weekly basis and had been staying with his owners for a week. They dog knew me well. During a family party, I was standing outdoors on the patio talking with someone and hadn't seen Sumo all day. Some of the party gowers said Sumo suddenly charged across the entire back yard and attacked me. That dog had me on the ground before I even knew what was happening. It took 5 men to pull him off of me. I ended up with stitches in both of my hands and claw marks across my face, arms and neck. Sumo ended up with a broken rib and was put in quarantine for 3 months, then released to his owners. My inlaws that owned the dog refused to believe he was dangerous, which was stupid because they had an infant at that time. That was my last visit to their home. Sumo lived to be 5, he was euthanized after biting their child and putting a dozen or so stitches in her face after attacking her while she was sleeping.
About 7 years ago, my Rotti, Rollie was laying in our front yard next to me while I was working on my flowerbeds. A blue pit bull that had escaped from a neighborhood about a mile away, ran into our yard in full charge and attacked him as he tried to protect me from the growling dog. The pit was coming after me not my dog. They ended up in a nasty fight with Rollie pinning the dog down by the neck and my husband came to our rescue. Rollie ended up with 16 stitches, various scratches and the pit ended up dying via screwdriver, the closest thing my husband could grab. We ended up calling the sherrif's dept, had to prove Rollie had his vaccinations, and requested the owner be tracked down. They had 2 prev complaints on file, the dog had escaped and attacked before. The deputy actually thanked us for ending the problem. It ended up in court, they tried to sue, we countered, and we won. Rollie had been trained by the German Police Dept in Griesheim in defensive protection to guard me and how to react to an attack. He had extensive behavioral training as well, and it paid off.
Our other experience was with three pit bulls at my friend's farm. Our horses were boarded there. On one occasion, we arrived to find the two pits chasing my horse in his paddock, both were trying to bite his lower leg areas, Buck was kicking, pinning, and running for his life! We ended up chasing the dogs off with a lunge whip. Two days later, they returned, this time going after my horse and one other, each horse ended up with stitches in their legs. We, again, chased the dogs with whips and trapped tow of them in one of the unused stalls in the barn. I had my husband put both dogs down, called the sherrif's office and went through the process again. This farm was about 13 miles from my home. One of the dogs had been collected by animal control for biting once prior. Again we were taken off to the side and thanked by the deputy. Several days later my friend called law enforcement to complain that the third had again come on to her farm and was chasing her dogs, when the sherrif arrived and tried to get out of his vehicle, it charged at him so he shot it. Carol's dog ended up with stitches to his mouth, and various cuts from the fight. She could have easily been injured or killed by the agressive dog, but did not hesitate to help her lab get away from it.
To make a long story short, when it happens you don't have time to consider options, you react and do what is immediately necessary. I am a huge animal lover and do not believe that any one breed is vicious or needs to be ended, but when faced with an aggressive animal attacking my boys, I will not hesitate to end the attacking animals life. We could have let animal control take the dogs, but they would have ended up back at home, getting out again and hurting someone else. I do not think that there are sufficient laws existing to protect people from bad owners that allow these animals to become aggressive, the owners of the dogs should have been held accountable.