When people try to engage Sherlock in small talk, I can imagine Tzo practically hopping up and down on a clue because OMG THIS TALKING IS SO BORING COME ON CLUES!!!

Hee! Yep. I also have an idea that when Sherlock is working on an experiment, Tzo continues to observe what's going on the room or around them. John's got used to having Tzo staring at him in the flat, or watching him type his blog, while Sherlock is doing something completely different in the kitchen.