The reddit poster who made this post does not know what they are talking about. There are a lot of things that play a factor. Caliber matters, stopping power matters, shot placement matters, FMJ vs HP matters, number of hits matter... but there is one thing that matters more than anything else and that is "How much fight do they have in them?" The real truth is that shooting any living thing is always highly unpredictable. ALWAYS. This is why cops are trained to mag dump. If you are in a dynamic situation with other contacts or possible contacts you need to manage your ammo and reloads... but barring that the training is "Dump the mag into them to be sure." Why? Because otherwise you ARE NOT SURE. The police have done countless studies on this subject and those studies are filled with accounts from both ends of the spectrum. Sometimes a perp takes 6 rounds of .45 APC to the chest and continues fighting for several minuets (an eternity in a gun fight) and sometimes someone gets popped by a .22lr and falls instantly dead to the floor and you can never tell which situation you are in until it is too late. You dump the mag everytime... and then you reload just in case. Edit: it's a post about dogs and i forgot to mention dogs... yeah, Dog vs Human matters and breed matters... but see the comment above.