My personal experience with the various "dangerous breeds" is limited and I've never owned any of them. I am not really a dog person and do not own one at all. I really don't even like dogs to be perfectly honest.
I will say tho that I've never yet seen a chow, pit bull Terrier, Rotweiler or doberman that I considered safe to be around for anyone other than their owner. If seen on my property running loose any and all of them will be killed and buried with no hesitation or remorse. I won't say no one owns one of them that they cannot control but I will say I've never yet seen one of any of those breeds that the owners could or did control.
The doberman is a very high strung dog and very excitable. Once long ago I quite litterally scared one to death. I gave it a heart attack I guess. It was preventing us from getting a washer and dryer belonging to me at an old house we used to use as a hunting camp. It had been rented out to some other folks and we went back to get my washer and dryer I had there when we used it as a hunting camp. The renters weren't there but their doberman was.
My friend who's wife owned the place wanted to wait to see if the renters would return but after an hour or so they had not so I told him to drive around back and let's get the washer and dryer. He asked me what about the doberman. I assured him I'd deal with it regardless of what was required.
I jumped out of the truck as it was on my side and with .357 Mag in hand began yelling at the top of my voice at the dog chasing it and yelling at the same time. That dog ran as fast as it could from me and when we left was seen leaning against the house on the far side shaking like a leaf in the wind. It was dead the next morning. I was fully prepared to shoot it had it been required tho.
I've found darn few bad ass dogs that will stand their ground against me when I make a full on attack as I did at the doberman. Most run and from that point on avoid me like the plague but then I think such animals can sense fear and hate and such and it's likely they understand just how much I hate and loathe them.
I am true dog person , but there are a few breeds I don't believe should be allowed to be in existence anymore.
and never around small children not even for a moment (supervised or unsupervised) as I believe they are just inbred ticking time bombs.
Greybeard touched on two..
My Buddy is a cop .. he had owned a chow since Birth approx 9 years .. when he exited the house on the way to work one day his chow attacked him and took him over a wood pile trying to get at his throat and face .. My buddy pulled his service piece and shot his dog dead. Then proceeded to the hospital where he took 45-55 stitches to his cheek, forearm, shoulder, Severely torn ear, and mangled thumb. His dog had never shown aggression before - just his little internal alarm clock went off ...tic.. tic... tic... BOOM.
About a year later he was called on the scene where a Pit had ahold of a small neighborhood dog and would not let go.
after several minutes they were able to shove a stick in the mouth of the pit and release the little dog ..at which point
the pit immediatly tried to attack the little dogs would be rescuers? My buddy shot the pit dead on the spot. Te owner of the dead pit swore his dog had never acted aggressively before Tic...tic...tic... BOOM
When a new neighbor moved into the neighborhood where I lived he came with a pit. The very first day I met him I told him point blank (but respectfully) , there are small children that play in this neighborhood and if I ever see the dog loose I will shoot him no questions asked. where he replied my dog is a good dog very well behaved. sure enough a few months later his well behaved pit got loose and attached 3 or 4 other neighborhood dogs before the owner could contain him TIC...TIC...TIC...BOOM.
That evening I told him he was lucky no little kid was riding their bike when he got loose. and two he was lucky I wasn't home or I would have killed him dead. - 3 months later after he paid medical costs for bitten dogs , costs for animal control .. court costs, and who knows what other costs etc.. he got rid of his well behaved Pit.
I say good riddance saved me the cost of a Bullet I know I would have had to use one day, cause in my opinion it is just a matter of time with Pits tic...tic..tic...BOOM.
I do not agree with last poster pits have to be trained to be vicious ,
They are born that way , it's in their Genes , training or no training it will eventually come out tic...tic..tic...BOOM.
The only good Pit is a dead pit period!!!! and no one will ever convince me otherwise. As for chows even before my buddy's incident. I would never own one if I had small children ..I don't trust them.