Hi and welcome to YT! My Mickey (he's my first yorkie.... I got him 6 years ago)... was exactly like your Sir Theodore. I had told my husband that Mickey was a really expensive hamster... (he did nothing... never cried... never chewed on anything... etc... ). He is just a really laid back kinda guy...
I thought all my future yorkies would be like him... My next yorkie Rocky was the complete opposite of Mickey.... cried and yelped all the time... He's since outgrown that.. .(he is 4 years old now).
Each little furbaby has their own personality... and I know you feel like your Theo should be a little more active... just give him time... you will accept him whatever his personality ends up being...
