I put it up on muley madness too. It isn't that he isn't big enough to get a shoulder mount, it is more to do with the fact that I don't want to spend the money on it at this point in time. Maybe some day I will, but for now a euro will do.
Get the cape tanned anyway. You can always turn a euro mount into a shoulder mount later on. Or, you can always sell the cape if it's in good shape.