I'm not sure which food would be best for Willy but I have heard that foods low in ash and magnesium are usually good. Since my Storm did become blocked 2 times and had to end up having the PU surgery and he has to be on a special vet diet for life. He's currently eating both wet and dry Royal Canin Urinary S/O formula and this helps prevent both struvite and calicium oxalate crystals. You have to buy it from a vet though and I don't if they'd sell it to you if your cat didn't have a problem yet. Since I have 4 males I decided to feed them all this food too and Pearl is also eating it. Ziggy will eat it eventually when she's a little bit older. They all love it and even though it costs more, it will save me in vet bills in the future. Storm's doing very well with this food.I've also heard that cat food that contains fish in it may also cause urinary problems but I'm not sure how accurate this is. Good luck.
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