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Wellness, Weruva and Royal Canin are all good choices. When it comes to a canned food, look for one with a named protein source of animal (not plant) origin. Choose a food that comes from the can looking like a hockey puck. Avoid foods with gravies or sauces. These are typically higher in carbs which can predispose a cat to obesity. Avoid meat meals, by-products as well as store or discount brands. These latter two contain low quality ingredients and more fillers.
In looking over Weruva's website, I see that they claim their food to be very low in phosphorous level. That's good, as phosphorous levels in the food should be low in cats with kidney problems. The problem that I see with the food is that is does not state if it is high in protein or not. The website says it has high quality protein, but does not provide if there is a restricted protein or not in the food. In cats with high renal numbers, it is recommended to have restricted protein levels in the food. That's because many of the toxic products that accumulated in the blood due to kidney problems are due to protein breakdown, so it's important to have reduced levels of protein in the diet. Because cats are obligate carnivores, however, this protein restriction has to be done with care. Given I cannot find any information about this food being low in protein, I would not recommend feeding it to Twitchy. It would be better to feed her a kidney formulated diet, such as Hill k/d or
I feel like Wellness fits all of those categories pretty well. I guess affordable is a very relative term, but if you are only feeding one cat, one of the large cans should last you a bit. This is what I feed to my three adult cats and they all love it. You will definitely need to go to a pet food store, tractor supply, or an online supplier to obtain this food rather than a supermarket usually. Hill's also makes pretty good quality (has a grain free line) food, but I don't think their wet food is smooth like you requested. Anyway, hope this helps!
I like EVO, Nutro and Avoderm brands. You ask 15 vets and you'll get 15 answers :) It is personal opinion for sure. I would try a brand and see if you cat likes it. If so, and it seems to agree with her then continue. If it doesn't seem to agree with her (diarrhea, vomiting, poor hair coat, less energy) then I would try a different brand until you find one that does agree with her. I hope this helps! Best wishes to you and Pitsy!
I always recommend choosing foods that follow the WSAVA guidelines which would include Royal Canin, Hill's Science Diet, Purina, Iams, and Eukanuba. https://www.wsava.org/WSAVA/media/Arpita-and-Emma-editorial/Selecting-the-Best-Food-for-your-Pet.pdf