I thought I would start a separate thread since that was an old spam thread.
badw0lf Prescription diet c/d by Hills is the only food I recommend for dissolving crystals in urine. Again after a few months and checking the urine pH and concentration (specific gravity) you can talk with your vet about transitioning to a non prescription diet, but only switch with discussion with your vet and monitoring the urine so your poor kitty hopefully doesn't end up blocked.
I recommend your kitties stay on different diets unfortunately. The c/d is less than ideal for your chunky kitty and honestly it would be so expensive to feed him too.
For fat cat I recommend Wellness Complete health or Fancy feast pate (no gravies!).
If you get to switch your kitty with crystals you may try wellness brand for him as well or possibly Royal Canin as they have designed their foods to help prevent urinary crystals but are a little higher in carbs than wellness.
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