Refrig noise EQUALS FOOOD! These guys are not stupid!
Some cats, like people, do become lactose intolerant... Strange but true and dealing with it? Requires new thinking? What about Soy milk? Didn't have to try it myself, but just throwing it out in the ring to let others more smart than I put their knowledge into to the pot.
Treats, or Bribery, can get you lots of places when used judiciously!

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's and Hope they all are happier creatures now.... - j