Hi sbd421-
Congrats on your new pup! However, it is recommended to wait until at least 8 weeks for pup to leave mom. I wouldn’t worry about transitioning pup to new food right away if you can continue with the Iams for a few weeks at least. He’ll be going through so many changes to begin with. Just let him get settled in. Labs are so full of energy! I should know, I have two. There is an entire thread devoted to large breed puppies on the diet and nutrition section. There is a lot of information on the requirements of large breed pups. Most importantly is the calcium content. It is explained very well on that thread on its importance to growth. Also Hound Dog Mom has a great spread sheet on the foods that are acceptable for them. She has listed foods that are both grain free and grain inclusive in all price ranges. Check it out! I’m not sure if you have had a puppy before, especially a lab, but you are in for a lot of fun! Keep an eye on him as they will eat just about anything. Lol!
