My Philosophy has been, that if you can teach a dog to Sit, you can teach them anything.
Dogs are not all the same. Every dog has their own personalities and how you teach one dog to sit may not work with every dog.
My method doesn't involve treats or clickers, but to understand each dog's unique personalities forming a connection and bond of trust that allows for a common basis of communication and learning between us. I learn from them as much as they learn from me.