Herrena, with respect to your experience in this area, I am a practising vet and I personally interact with over 30 different dogs, many of which are anxious, fearful, painful or unwell, on any working day. The vast majority of behavioural issues are actually worsened by the application of rank reduction techniques. The overwhelming majority of aggressive incidents result from fear and anxiety.
Bradshaw, Blackwell and Casey's 2009 paper www.journalvetbehavior.com/article/S1558-7878(08)00115-9/abstract discusses the idea of dominance as a personality trait in detail and concludes that it is not helpful or appropriate to apply this construct, which is inherently relevant, to individual animals. Feral dogs do not even live within firm pack structures. They are opportunistic scavengers and show little co-operative behaviour. So it's ludicrous to suggest that they would interpret any of our behaviour in terms of a pack.
Dogs do what works for them to get what they need. That's why a dog which has anxiety about food resources growls to warn you off its bowl. It isn't dominating you. It's telling you, the only way it has available to it, to back off. If you don't like that behaviour you can modify it easily by adding food to an empty bowl so the dog learns you bring food, you don't take it away, and then you can all live happily. Conversely if you subscribe to the dominance bunkum you'd frighten, threaten or hurt the dog until it no longer expressed its negative feelings around food, probably getting bitten in the process, also elevating fear which inhibits learning. It's a lose lose situation.
Who do something the bad way if you can do it the kind way and get just as good, or usually better results?