I want to buy a good n brave dog. should i buy a doberman, a German Shepherd or a Labrador, Golden Retreiver?

I am a sog lover n plan to soon buy my dog.i have heard Doberman is very ferocious n can attack its owners also?? how much would a Golen Retreiver cost?? Should i buy only a pedigree dog?? How much would a gud dog cost? Do i have to feed him only non-veg or even Veg food would do for my dog.
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