I don't have experience with prick eared puppies, but my guess is that by the time your pup hits puberty, his/her ears will prick by then. *shrugs* Not sure, but because he is a Chow, his ears should be stiffly erect by adulthood.

Ears small, moderately thick, triangular in shape with a slight rounding at the tip, carried stiffly erect but with a slight forward tilt.
It goes on to say that drop ears are a fault. Then, again, your puppy is a mix, so nobody can really say for sure. Adorable, though!