That's great news for Merlin - no more shots! You must be thrilled too.
One of my cats developed diabetes after a steroid injection several years ago; she was on insulin for about a year, then her blood sugar started coming down on its own to a more normal level. She's been off insulin for at least two years now ( it's not uncommon in cats for diabetes to self-correct.) I must say that Muffin still drinks copious amounts - and hence pees the same image - but that's not such a bad thing for a cat that used to get cystitis! Hopefully Merlin can look forward to a happily needle-free future.

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Karen in Singapore
Current WIP: Mirabilia's "Villa Mirabilia"
My Cross Stitch Album