What to feed my cat with oxalate-related FLUTD?

If he's already infected, you will need to get him more antibiotics.

But you can prevent future issues and help his current problem with proper hydration.The prescription stuff won't help since it's dry and cats are designed to get most of their water from food (plus the prescription is made to treat struvite crystals, so it increases risk of oxolate crystals). That's the way nature designed them, they have low thirst drive. When fed dry, they won't drink enough to compensate for the lack of moisture. They will only consume about 50% of the water they should be having. This can lead to kidney disease, UTI, crystals, blockage, renal failure and more. Especially since you have a tom, this is crucial. Male cats have a narrower urethra than female cats and are more prone to blockage from the crystals.

The only way to give the cat it's natural hydration is to feed it wet food only.

But some wet foods are not of a very high quality, either. That goes for most commercial foods. Just like the dry, they are often made with cheap fillers such as corn, wheat, soy, rice etc. These are not a part of cat's natural diet (it’s an obligate carnivore – it eats meat) and they are not designed to digest it. Grain is carbohydrate which the cats can't process and it turns into blood sugar and fat, causing diabetes and obesity. In the wild, where cats only hunt for meat, diabetes and obesity are unheard of. It's us who cause these by feeding a species inappropriate food.

We usually read labels on our food, but rarely on the food for our cats. Learn to read the label and understand the ingredients. The healthiest food to feed apart from raw feeding is grain-free wet food with no by-product. Some good brands are Wellness CORE, EVO, Merrick, Nature's Variety, Blue Buffalo Wilderness and more. These will give your cat the proper hydration and nutrition it's designed to get and it will be strong and healthy. But any wet food (the best wuality you can afford now, meaning least grain) will be much better for him than even the best dry, because he really needs the water from the food.

If you switch it's diet, do it gradually, by mixing the current food with the new one over couple of weeks until there's only the new. This will prevent diarrhea and upset stomach.

You will probably get a lot of different answers, so google feline nutrition or look at the links below, and do the research for yourself. I personally wasn't able to find one reliable source (besides the pet food industry) that would say grain is beneficial for cats or that dry is beneficial for them.

Read this in urinary tract health: http://www.catinfo.org/?link=urinarytracthealth

More on cat nutrition below,

Good luck!

One of mine has a history of this. I ended up switching to grain free, low-magnesium foods. While he had the infection I was giving him 100 IU of vitamin E a day, along with some B6 and some olive leaf extract (a natural anti-microbial that I'd read was safe for cats). He'd been on several rounds of antibiotics at that point from the vet and had once again started peeing blood.... the vet couldn't get him in for several days (which really ticked me off), and so I searched online for something I could do myself in the interim..... by the time the vet was able to see him 4 days later, he was already on the mend. -- it is now a couple of years later and he's been fine ever since.

Will that work for your cat? I don't know. I can only tell you what my experience was and let you decide what's right for you and your cat.

I can tell you that getting olive leaf extract into a cat is a mighty task.... it's not anywhere NEAR being anything they'd consider a "taste treat".

Go online, and this question can be better answered by professionals. Internet, Encyclopedia, or your veterinarian. These types of problems are not your everyday fixes. I don't claim to have all the answers, although, I have had several male cats. Some neutered, and some not neutered. My males that were neutered, seem to have more health issues than those not neutered. Also, my males that were not fixed, lived longer. Even my spayed females lived longer than my neutered males. I have my opinions. Can't share them though, because I'm only an experienced person from day to day one on one issues. Though sometimes I don't feel even the best Doctor has the answers.