With Rottweillers (I'm unsure of other breeds) you actually have to pick the pup up by the scruff of the neck and hold them there for a few seconds during obedience training, as their mother would to discipline them (not saying do it willy nilly for everything and you must do it very very gently, and only when the pup is very small). It doesn't hurt the pup, and I can guarantee you it doesn't turn them aggressive. Our rottie was a pain in the ass as a pup, would follow you round the house and nip your ankles and feet and would he hell listen or stop. Pure mischief. We ended up getting a breed specific trainer in to help, and that was the method he showed us. But with bully breeds like rotties you have to have control, as they fight for dominance every step of the way. It's like they're forever teenagers haha they also do this thing called 'blocking', obviously drilled into them from their herding days, where they stand in front of you and, well, block you. To stop them doing this, and you must, you need to literally walk through them and push them out the way with your legs. And trying to walk through a 135lb dog isn't great, you feel awful doing it, but you're basically telling him 'you can't do this to me'. But these are dogs that you need to take these measures with, because they will always fight for alpha, but will put themselves in harms way to protect you. In all honesty, I think a lot of that dominance bullshit is a silly idea, different breeds require different training, and react differently to methods that would work with other breeds. I don't think pinning a pup to the floor is okay though, I think it's quite a scary experience for a pup, especially a young one that doesn't quite know what to expect from you. At least with picking them up by the scruff, they make the correlation between that and their mother. Complimentary picture of our big handsome boy :)