How big will my dog get?

He's a boxer/pomimo (pomeranian/eskimo) cross and at 10 weeks he was 12.8 lbs, and today at 14 weeks he weighs 16.5lbs - we're just trying to figure out how big he'll be as an adult. My guess is 40-50lbs, others say closer to 60lbs...anyone out there have a pup that weighed the same at 14 weeks? What does it weigh full grown?