First is the 4health food you have her on a puppy formula? Second, at 40 lbs at only 4 months she sounds like she’s going to be a large breed dog so a large breed puppy food would be best. I always recommend wellness core puppy or wellness complete health large breed puppy. If she’s just big for her age instinct raw boost puppy is good for medium dog breeds.
As for the cooking chicken and rice, I wouldn’t do that. At least don’t make it anymore than a treat. Chicken and rice isn’t a balanced meal and shouldn’t make up more than 10% of the puppies diet. A canned food like Merrick, instinct, wellness core would be acceptable and good quality and properly balanced for a dog. If you plan to make the canned more than 10% of the diet then a puppy canned food would be necessary for proper nutrition.
