Cats probably like the rich taste of milk, but in fact, cats are lactose intolerant. A little milk may not have serious consequences, but it can lead to stomach upset or diarrhea. None of you will be happy about this!
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Only very small. Seals grown from a dairy age usually do not digest lactose well. Although not always, this is quite individual. You can give some fermented baked milk, sour cream or kefir.