Well, goat's milk is much better than cow's milk. It's lower in lactose, so less likely to cause allergy problems.
Except for the weaning process though, I'd be wary of giving a pup milk on any sort of regular basis. Calcium supplementation isn't actually a good thing (excess calcium is a major cause of growth and musculoskeletal disorders, and should only ever be given if an actual deficiency has been diagnosed. And that's fairly rare.).
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