We chose our first food to meet and exceed adult dog nutritional requirements (an adult being defined as 1 year or older). AAFCO (the governing body in the US for dog nutrition) has different guidelines and nutritional standards for different life stage claims - including puppy, adult and senior. This is why you see “puppy foods” and “adult dog foods.”
You could check with your vet to see if it would be alright to supplement some of our food into your puppy's diet!