I am sorry, Volvie, but C”S in the USA is NOT non-kosher by any stretch of the imagination. Perhaps in Europe, where mare’s milk might have been substituted for cow’s milk, it was a problem decades ago, but there is no such problem with USDA grade A milk, which can only be certified as such if it comes from a cow.
I am not telling you to drink C”S, as I respect your decision to use only C”Y. But to refer to it as non-kosher because of a shitta that you choose to follow, is unfair to the hundreds of thousand of KOSHER Jews who do NOT drink only C”Y, as per the shittos of other Gedolim, who matir C”S. We get into this argument with the C”Y drinkers on a semi-regular basis, and IMO it is wrong to assert that C”S is not kosher. You hold to a different standard. Fine. Your standard is your decision The milk we drink in this country all comes from a cow. And the last I heard, all cows are kosher animals. So the milk from every one of them is only milk.