Kito is the most stubborn dog in the world. Shibas are know for thier independence, and he shows it. He knows how to come, and sit and everything else, but does it when he wants to.
My only suggestion is to work on these commands in small time increments. Mickey probably doesn't have a huge attention span, so 5-10 minutes is probably enough.
I'm sure someone else on here can help you more though.