Liz Buchanan BVSc MRCVS
Keymaster
Usually if an animal was drinking more and more frequently, we would check something known as the Specific Gravity of Urine. This is done by looking at urine through a special device called a refractometer and tells the vet whether the cat is capable of making concentrated / dilute urine (not possible in some illnesses eg. kidneys), and whether the urine is dilute or concentrated (either extreme) to a point of pathological concern. They can also test for glucose in the urine (indicates diabetes), for signs of bladder inflammation etc. A lot of concerns are confirmed or disproven from a urine sample. I wonder whether your vet has seen one? It is possible to get a special cat litter that doesn't absorb urine, to help in the collection of such a sample. In the UK at the moment we are having a heat-wave, so it is important for cats to keep their hydration levels under control. It would be nice if this accounted for your cats' change in urinary habits, but we would recommend letting the vets check a urine sample if they haven't already. I'm afraid that we do not offer second opinions here; I am no more specialist in this particular subject than your own vet ought to be. However, you can ask for a formal second opinion at any time by arranging one through your vet. Most vets are happy to do this because if they are right, it's good PR that helps to convince an owner of that. And if they are wrong, then they can learn from it. Wishing you and your cat all the best and please let us know how you get on
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