Do you believe in dominant and submissive dogs?

It may sound strange but I am wondering how many of you believe that dogs act either dominantly or submissively, the trainer i went too for GCDA said that she didnt believe this at all and yet obviously you do come across trainers who believe you must show dog who is boss etc ( i dont mean by punishment neccessarily)

i am not sure i believe that it can be as simple as one animal being the dominant one.
i find it hard to believe that my dogs are constantly trying to get on over on my or dominate me as my dog groomer would have me believe.

is the thought of dominance old fashioned?

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