I agree with Jan, try positive reinforcement with "name training". Take 5 minutes a couple times a day, get some small treats or some toys that he enjoys, then call his name. When he looks at you in response, reward him(verbally and with the fun stuff), and slowly back off rewarding with toys and treats and use verbl praise. Just one method I'm sure there are others out there. I am assuming he hears fine is that correct?
Mike
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Gunther (1999-2004) beautiful flashy brindle male waiting at the bridge
Jacquets Ramos 7 mo old cropped/docked flashy brindle male s/d