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You had a dog that bit people for a year and then you beat his ass and he became a gentle dog?
Bullshit.
I was patient for for over a year and tried every trick I knew to correct his behavior. And as someone whose owned 8 boxers over the years I have a lot of experience dealing with that particular breed and their habits.
Nothing worked. I finally resorted to the alpha male solution which is always the last solution.
Thankfully it worked. The alternative would have been a trip to the back forty and a bullet which thankfully I was able to avoid.
Stop pretending you know jack shit about dogs.
As dogtrainers...we keep a lot of tools in our toolbox and some are indeed last resort. I am not a big proponent of the alpha stuff, but if it worked when nothing else did, the. Maybe it was the right tool. We have to be flexible.
Taking the Alpha role is fine, and sometimes it's necessary with dogs. The physical abuse though is a whole 'nother smoke.
Violence begets violence. It's not necessary to inflict violence to make the Alpha point.
There is a boatload of misconception about "alpha" roles - it became really popular and people like Cesare Millan made it stick but a lot of pack theory is based on really faulty science: the idea that dog packs function like wolf packs.
They really don't. Dogs evolved away from wolves a long time ago - they evolved as scavengers hanging out in the outskirts of human habitations and that required a different more fluid social structure. The other misconception is the idea that wolf pack alpha's are always going beating up subordinates and showing them who's boss. There are relatively few fights for dominance in a wolf pack (which is usually constructed of close family members). The real alpha's just "are"...they don't have to do much, they have presence. It's the INSECURE alpha wannabe's that are always posturing and mounting and starting fights.
In dogs - there is no clear alpha because dog pack dynamics are very fluid. One dog might be alpha when it comes to leading a chase, another might be when it comes to the best spots to sleep in. Dog's evolved to defer to humans as part of their pack order - wolves never did and even when raised by humans as pups still don't see humans as part of their pack structure. It's a key difference between the two.
A lot of alpha theory insists that you need to forceable roll a dog over and pin it to "assert" your dominance (mind you - wolves seldom do this and don't go around rolling their mates at every provocation). This sort of "training" is STILL advocated by some despite the fact it is a damn good way to terrify a dog, get bitten, and destroy trust. Alpha and leadership are not necessarily the same.
Good leadership - consistent fair rules, clear boundaries. There are a lot of ways to attain this that don't involve physical altercation with the dog.