Hi Lorelee-
Others may have different opinions, but I feel it is best to keep a large breed puppy on a puppy formula that is correctly formulated for a LBP until 18 months of age. Most are done growing by then and it gives an extra cushion of safety to make sure they are still growing slowly. However, a lot of people switch to an adult maintenance food at a year old.
Also just wanted to mention, now that he has been neutered, watch his calorie intake even more carefully. Neutered dogs can gain weight easier because of hormone changes and one of the worst things for a LBP while they are growing is to gain weight.
