Not only that, but Redbeard was in fact the ONLY real character in the entire show.
Every other character in Sherlock existed purely in a dog’s imagination. After his owner spent yet another evening sitting inside reading detective stories, Redbeard dreamed of having a different life where his owner was much more adventurous.
Yes, it all seemed to take a tragic turn at the end, but that was because it was the kind of dream where you wake up and learn a lesson about feeling grateful for what you have. Instead of ceasing to exist in a sudden collision of angst and plot twists, Redbeard actually woke up, got a treat, and then was taken to the dog park where he could play with his friend Eurus the Greek Shepherd while their owners sat on a bench reading. (Eurus’ owner only reads about airplanes. You should see that dog’s dreams.)
This theory, of course, explains why the only other dog we saw Sherlock interact with was pretty pathetic at his job. Sorry, Toby, but Redbeard wasn’t going to invent a true rival in his own dream.
I don’t know about you, but I’m feeling pretty okay with the revelation that we’ve all spent half a decade obsessing about the imaginings of a very creative pup. Good dog, Redbeard.