For example, you're going to need to train a Belgian Malinois or Pitbull much differently than a Golden Retriever.

And yeah, dogs have their own personalities (so do practically all other animals), and it confuses me that more people aren't aware of this. The world can be much richer once one realizes this.

A Labrador is more likely to have been trained to be a sociable, a Rottweiler to be aggressive. It’s reasonable to assume the breeds will behave in a particular way because they’ve probably been trained that way. Even when we don’t think we’re training them, our expectations cause them to behave in a certain way.