When I visit you and your dog, “I tune in” on the dog by closing my eyes. When I open them again, I start talking, and I’m now in contact with your dog. I don’t require any information from you in order to be able to communicate with your dog.
You may find that your dog gets tired, starts yawning or falls asleep during our session. The advantage of me being physically present is that you are able to see how your dog reacts. Perhaps you will even see changes in its behaviour immediately or be able to test them with me during the session; for example, if the dog is scared of clippers.
Another advantage is that you get the opportunity to ask questions during the session and thus interfere with the communication.
You can consider me as an interpreter between you and your dog.