With Royal Canin you must follow the chart on the pack for the amount of feed you give him. He can be on the Starter pack now and after three months, on the Junior Pack for Labradors. Royal Canin is a little heavy for our weather conditions so maintain the feed at less than what is shown on the chart. No supplements are required. Remember your Dog will be about 30Kg in weight as an adult so you can base your calculations on that as shown on the pack. Please do contact your Vet for his Cold and Congestion as a prolonged Cough can lead to complications.