I think from the results from the poll (though still feel free to vote if you haven't) a logo might be the best and most versatile thing to put on the shirt!
The redundancy issue was basically instantly fixed by simply removing the little ears from the collar! I was also thinking the logo could change based on what animal the boys are, and giving room to more animal boys! The name of the whole franchise will probably be changed too.
Speaking of which, got any suggestions as to what new animal boys could be added to the cafe? and also what kinda stuff do you think this cafe should provide? my first thoughts are chubby cow boys, and also some special "milk" drinks ;)..