I don't know if this question has been asked before so I am asking. Moose will be 1 years old on Sat. and I would like to know when is a good time to change him to an adult dog food. He is now eating Wolfcub Large Breed Puppy Food. Should he be changed now or when he is 18 monhths since they still develope until 18 month or so. Any advise would be great.