Many gradual changes occur as the puppy develops and its ability to digest foods changes. To cite only one example, the number of lactose-digesting enzymes gradually decreases, while the ability to digest cooked starch increases much more slowly. These variations explain why some puppies cannot tolerate cow's milk (which is three times richer in lactose than bitch milk), and why it is sometimes sufficient to limit the amount of cow's milk fed to stop diarrhea caused by exceeding the digestive ability of the lactases.
These changes are essentially genetically determined and depend very little on the eating habits imposed on the puppies.
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