I just adopted a 2year 4 month old St. Bernard. He has all his required shots and has microchip. Just had his fist medical check since I got him 2 days ago. The DVM said he was a healthy young dog . So my question : Is the Costco Kirkland dry dog food reliable (in quality) for my dog ...He weights 103 lbs. Or should I feed him ground beef with cooked vegetables mixed in and add vitamin tablets.